One scripture that shows the ten commandments themselves were imperfect is found in 2Cor. 3:6-8
'Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life. But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away: How shall not the ministration of the spirit be rather glorious?'
Here the law that was engraven on stone is spoken of as a ministry of death. Not the glowing perfection that you and others constantly put forth.
Hmm...it seems to me that the "glowing perfection" of that law which ministered death was clearly seen in so much that they couldn't even look at the face of Moses (which glowed by the way).
Again, this scripture does not say that it was not perfect, only that it resulted in death for those who did not obey. Which again makes the law perfect in leading us to Christ.
So yes, you have yet again given a scripture without it showing that the law was not perfect, only that we were not able to look at it because of how perfect it was.
Now as to your examples:
I would like to give you a set of scriptures that explains these.
Matthew 12:2-13
2 But when the Pharisees saw it, they said unto him, Behold, thy disciples do that which is not lawful to do upon the sabbath day. 3 But he said unto them, Have ye not read what David did, when he was an hungred, and they that were with him; 4 How he entered into the house of God, and did eat the shewbread, which was not lawful for him to eat, neither for them which were with him, but only for the priests? 5 Or have ye not read in the law, how that on the sabbath days the priests in the temple profane the sabbath, and are blameless? 6 But I say unto you, That in this place is one greater than the temple. 7 But if ye had known what this meaneth, I will have mercy, and not sacrifice,
ye would not have condemned the guiltless. 8 For the Son of man is Lord even of the sabbath day. 9 And when he was departed thence, he went into their synagogue: 10 And, behold, there was a man which had his hand withered. And they asked him, saying, Is it lawful to heal on the sabbath days? that they might accuse him. 11 And he said unto them, What man shall there be among you, that shall have one sheep, and if it fall into a pit on the sabbath day, will he not lay hold on it, and lift it out? 12 How much then is a man better than a sheep?
Wherefore it is lawful to do well on the sabbath days. 13 Then saith he to the man, Stretch forth thine hand. And he stretched it forth; and it was restored whole, like as the other.
In these scriptures we see Jesus answer the issue. He said it was actually lawful for these things to be done! In verse 7 He says that if they understood then they would not have condemned the guiltless.
So your examples are not of the guilty, but of the innocent. Because as Jesus said "It is lawful to do well."
Jesus makes the statement a few times which is a quote from Hosea 6:6. He said go and learn what this means, "I would have mercy and not sacrifice."
Then again He says it in these verses and claims these people are innocent of breaking the law. Please be sure to note that He is speaking of the same law of Moses.
As time goes on they still don't get it. So He basically lays it out for them.
Matthew 23:16-24
16 Woe unto you, ye blind guides, which say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor! 17 Ye fools and blind: for whether is greater, the gold, or the temple that sanctifieth the gold? 18 And, Whosoever shall swear by the altar, it is nothing; but whosoever sweareth by the gift that is upon it, he is guilty. 19 Ye fools and blind: for whether is greater, the gift, or the altar that sanctifieth the gift? 20 Whoso therefore shall swear by the altar, sweareth by it, and by all things thereon. 21 And whoso shall swear by the temple, sweareth by it, and by him that dwelleth therein. 22 And he that shall swear by heaven, sweareth by the throne of God, and by him that sitteth thereon. 23 Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone. 24 Ye blind guides, which strain at a gnat, and swallow a camel.
If the law of Moses was less than the law of grace, then those who say it is not perfect have strained at a gnat and swallowed a camel. Because the law of mercy and grace is greater.
It seems people can swallow the thought of forgiveness, but not repentance. So then they are the ones who appear right on the outside. Because they say "we are free from the law". But on the inside they are dead without having repentance.
Note that Jesus said you should have mercy, judgment, and faith, but not leave the rest undone.
The law and the prophets hang on two laws. Love God, and love man.
Every law must be seen in light of those two.
Like the gift and the alter. The alter is greater than the gift.
Now here is the issue...we are all guilty of breaking the law. But when we repent and turn to Jesus we are found innocent. Because the law was for the purpose of bringing us to Him. It was perfect, and we are not. So we needed a savior.
Romans 3:31
31 Do we then make void the law through faith? God forbid: yea, we establish the law.
Here is the proper use of the law. It is not to be justified by doing what is written in it. It is to be justified through having to acknowledge our sin and turn to Jesus.
After we do so, the law is not void, it is established. Once we come to faith, we will do the things contained in the law.
Here is a quote from the link I gave:
"1 Timothy 1:8-10
"8 But we know that the law is good, if a man use it lawfully; 9 Knowing this, that the law is not made for a righteous man, but for the lawless and disobedient, for the ungodly and for sinners, for unholy and profane, for murderers of fathers and murderers of mothers, for manslayers, 10 For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, and if there be any other thing that is contrary to sound doctrine;
"Notice the last verse said that the law is for anything other than sound doctrine? That means if the Bible says something is a sin then we should not teach otherwise. If we do teach otherwise then we are guilty as Jesus said.
"We are not supposed to simply throw out all solid teachings on what is right and wrong. We are supposed to fulfill those things through walking in love. So yes, we should follow the law of God."