I was actually wondering what you think of the fact that somebody in the Old Testament who gathered sticks on the Sabbath day had to be stoned.
This was a law but if you read you will not find that much of that took place. A lot of the laws given to the Children of Israel (CoI) when God had just called them to be His people. God had a plan and they agreed and said all that you say we will do. He delivered them and they entered into a covenant with Him.
When the new covanent was initiated two people dropped dead for a simple lie. The point is this, at the begining of something that God does He makes all aware that He is serious and will not play around. Not that He's waiting to come down on us but He must do as He said. The reason He made such laws is so He could have a distinct people to reveal to the world what He was like and to introduce the Savior of the world, to the world.
Also, if I tell someone not to go into a certain part of town or they will get shot and they go anyway, who's fault is that if they get shot? Not mine, but theirs. Like wise if God says don't do that or you'll die and you do it, who's fault is it if you die? Not God's but yours.
God told Adam and Eve not to eat of a certain tree or they'd die and they ate anyway and they did die spiritually and eventually physically. But praise God that He promised a way for them to be redeemed.
In the OT for some people certain offences were not forgiven. It doesn't seem to be a matter of who it is but what time these offences take place. Usually at the beginning of a ministry (bears killed children who mocked Elisha) or when God starts a movement. I am sure there are other times that God permits Satan to destroy some who have rejected Him to the point where they have damaged their ability to respond to Him and have become extremely vile. There are somethings I know nothing about, but I don't know that I can trust God because He died for me so that I can and whosoever will, be with Him for all eternity.