A problem here is one that, unfortunately, bible fundamentalists perpetuate, that God does not change therefore everything He has required of man (or not required of man) has also not changed over the years.
Jesus Himself refutes that:
Jesus replied, “Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning. -- Matthew 19
You have heard that it was said to the ancients, ‘Do not murder’ and ‘Anyone who murders will be subject to judgment.’ But I tell you that anyone who is angry with his brother will be subject to judgment.
....
Again, you have heard that it was said to the ancients, ‘Do not break your oath, but fulfill your vows to the Lord.’ But I tell you not to swear at all: either by heaven, for it is God’s throne; or by the earth, for it is His footstool; or by Jerusalem, for it is the city of the great King. Nor should you swear by your head, for you cannot make a single hair white or black. Simply let your ‘Yes’ be ‘Yes,’ and your ‘No,’ ‘No.’ Anything more comes from the evil one.
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You have heard that it was said, ‘Eye for eye and tooth for tooth.’ But I tell you not to resist an evil person. If someone slaps you on your right cheek, turn to him the other also; if someone wants to sue you and take your tunic, let him have your cloak as well; and if someone forces you to go one mile, go with him two miles.-- Matthew 5
In all these cases, Jesus is directly addressing what the Mosiac Law did indeed say to those old Bronze Age Israelites, and He is directly refuting it, placing what God really wants of man into the modern context of Christianity.
And He explains why: Because the hearts of those Bronze Age men were too hard to meet the performance level that God really intends.
It's not different from what I have expected of my own children over the years. When they were babies, I tolerated them not being able to use the toilet themselves. I tolerated them making a mess at mealtimes. I tolerated them crying when they were unhappy...or even bored.
I would not tolerate that behavior from my adult children today. I haven't changed...but my expectations of my children have changed.