For the spiritually dead and unlearned the Law is bad but to those who are born of God the Law is godly love. When Cain murdered his brother he violated the principle of godly love and God called it sin even without the Law on stone. Not only did God call it sin, Cain was convicted and condemned because he sinned.
Let me tell you the trick of Satan. Satan can take what God says is bad and make it look good. God told Adam and Eve not to eat of the fruit because it would be bad. Satan turns that around and makes the fruit look good and God look bad for saying something is bad when it's really good.
God says the Law is holy, just and good but you say the Law is bad. Now who told you that? It wasn't God because He does not change. He does not say it's bad to worship other gods and then turn around and say it's okay to worship other gods. He does not say it's bad to dishonor your parents but then He turns around and says you can dishonor your parents if you want. He does not bless and sanctify the seventh day and protect it with His Law and then say it's now a normal work day.
The Law is the principle of love. To say the Law is bad you are saying love is bad and when you say love is bad you are saying God is bad because God is love.
You say the Law kills, Amen! We need the Law to kill that part of us that needs to die so that we can come alive to God. The Law puts to death the old man that is full of pride and self righteousness. The Law on stone does that but the spirit of the Law is not to define sin, but rather, to define godly love.
You cannot say that you love God and man yet violate the principle of godly love defined by the Law.
Those who are born of God spell law like this, L-O-V-E.
Romans 13:8-10 Owe no one anything except to love one another, for he who loves another has fulfilled the law. For the commandments, You shall not commit adultery, You shall not murder, You shall not steal, You shall not bear false witness, You shall not covet, and if there is any other commandment, are all summed up in this saying, namely, You shall love your neighbor as yourself. Love does no harm to a neighbor; therefore love is the fulfillment of the law.
When you love God and man the way God defines love you will look like someone who is keeping the commandments. That includes honoring the fourth commandment.