His judgments are righteous.
The fear of the LORD is clean, enduring for ever: the judgments of the LORD are true and righteous altogether. (Psalms 19:9 KJV)
All those people would have been dead by now anyway, wouldn't they? So who are you to judge God?
Is God not free to do with his creation as he pleases? Or must he run everything by you first?
BTW do you Fear the Lord?