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If you are a Christian or a Jew, are you of the opinion that Yahweh is a genocidal maniac? I’m guessing not. So why not? How is the violence of Yahweh justified? How is the violence of the Israel armies of the old justified? How can Yahweh claim to have a monopoly on morality, with a track record such as His?
I believe God has given life. Because of that I think He has the right to decide how long life He gives. If He would think that is is good that I live only for example 20 years, I don't think I would have anything to complain, because I have not done anything to have even that. There simply is no good reason why God should give more than what He gives. (And no, humans don't give life, they give birth, which is not the same).
However, God has promised to give eternal life for righteous and others have death. I think that is very nice, because I don't think He would have to do so. Even short life would be a great gift.
By what the Bible tells, death is for evil unrighteous people. Would you think it is good, if God would let evil to continue for ever and make this life eternal suffering for all? I don't think it would be good, that is why I can accept that God doesn't let all live eternally.