Wait this is like quite wrong on multiple levels. First you seem to assume off the bat that morality is independent of God. This is simply untrue, and in fact God is the one who defines what is moral and what isn’t. Second your analogies of monarchy don’t hold at all because God is not corrupted by power. He cannot be corrupted as He is perfect, so “absolute power corrupts absolutely” doesn’t apply to Him. The reason humans are corrupted by absolute power is because we are flawed. Third, your discussion about how if God is all-knowledgeable it doesn’t allow Him to retry things makes no sense. Logically by being all-knowledgeable, God knows all outcomes possible, and chooses the most optimal set of actions. Finally, your discussion of Buddhism seems to be somewhat irrelevant.

The reason God cares for us is because we are His creation. In Genesis it tells us that God specially created humans in His image to take care of His creation. However, we messed it up by rebelling against Him in a form of cosmic treason. Since God is a God of Justice, He must necessarily judge and condemn the sin we commit, since He is the arbiter of morality. But since He loves us and is merciful, He doesn’t wish to see all of humanity condemned apart from Him forever. So in order to atone for this treason, He Himself intervened by sending a Messiah who is Christ the Lord to take on the payment necessary to cover the offence of the treason. He did this so that all who choose to follow Him would not be condemned, but rather be within His love forever.

There is no reason to throw out God having justice, mercy, morality, or love simply because He is in charge. In fact, it’s quite coherent that He has all of these traits.