Why is it okay when God kills people?

[Aroura]

"A God who could make good children as easily as bad, yet preferred to make bad ones; who could have made every one of them happy, yet never made a single happy one; who made them prize their bitter life, yet stingily cut it short; who gave his angels eternal happiness unearned, yet required his other children to earn it; who gave his angels painless lives, yet cursed his other children with biting miseries and maladies of mind and body; who mouths justice and invented hell—mouths mercy and invented hell—mouths Golden Rules, and forgiveness multiplied by seventy times seven, and invented hell; who mouths morals to other people and has none himself; who frowns upon crimes, yet commits them all; who created man without invitation, then tries to shuffle the responsibility for man's acts upon man, instead of honorably placing it where it belongs, upon himself; and finally, with altogether divine obtuseness, invites a poor, abused slave to worship him!"
~Mark Twain, A Mysterious Stranger.

I love that line from the, "I can do no wrong, for I do not know what it is", even though the line in the books is a bit different, it conveys the same alien monstrosity that Twain seemed to view as God in the latter part of his life.