God cannot do whatever, and simply because he is God that makes it right.
Jhn 8:55 Yet ye have not known him; but I know him: and if I should say, I know him not, I shall be a liar like unto you: but I know him, and keep his saying.
God cannot do whatever, and simply because he is God that makes it right as Luke seems to suggest. Here Jesus said that if he were to deny that he knows the Father, he would be a liar like any other man.
God did not kill Jesus, he offered him to save mankind, huge difference. And Jesus did not commit suicide, he willingly offered himself to save man. It is like a soldier who leaps on a hand grenade to save his fellow soldiers, or a fireman who loses his life rushing into a burning building to save a child.
It is like parents who allow their child to go off to war to defend their country. Do we think these parents killed their child? No, at least I do not consider it that way.
Nor do we say of these parents that they bruised their child. That's why your illustration does not work (though it is a refreshingly good one).
God bruised his Son according Is 53. God the Father was not passive in the death of his Son like parents who offer their sons in war.
What was poured upon Jesus was not just the wrath of Rome or the wrath of the Jews: it was the wrath of God.
It PLEASED the Lord to bruise him when he made his soul an offering for sin.