It's true that God has killed people, including children whose fate was determined mostly by their ancestors' conduct. Also, God allowed people to die through accident and sickness, including many children. If that was it, according to the human concept of death—permanent, finality, end of hope—then I could agree with you. But if God can and will resurrect, as He says, and if Christ did die for all of us, and if God has a plan cleverer than commonly described, so that the vast majority of humans will end up being able to live forever in peace in a huge unified family—then God is good. A large blocker in this is the common concept of eternal hell, an idea which come from some other place besides the Bible (Greek philosophy?).