I don't think every bad parent out there should be sentenced to death, if that's what you're asking. But people that do something like rape an innocent child that has no possible way of defending themselves should absolutely die. Their life has no value at that point, and they no longer deserve the right to live and be happy like the people that don't commit the most vile kinds of crimes.
Let me just make clear the fact that I don't take the death penalty lightly. It's not something I think should be applied to every crime, or act of negligence (or even close to that). But again, the worst of the worst don't deserve the same rights as the people that have no desire to harm others.
Do you really think that people like Michelle Angela Blair, the mother that killed her two children, stuffed them in a freezer, then hid it for two years so she could keep getting child support, deserves the same rights as me or you? I don't, and I don't understand how anyone would.