My point is that even if innocent people are sometimes executed (I'm not aware of any stats on this), that doesn't mean that justice should not be carried out because the system is flawed in some ways. After all, some people serving life in prison are wrongly convicted or the court went crazy and give them too harsh a sentence, but that doesn't mean life in prison should not be an option.
Tell me, what would you have done with "people" like this:
Dnepropetrovsk maniacs - Wikipedia, the free encyclopedia
(Personally, I would be willing to torture and kill them slowly myself just for what they did to those animals, let alone the human victims. They deserve pain and suffering. But I'm willing to leave that to their final destination in hell after we remove the trash from this plane of reality.)
What about drug lords and crime lords? Even if they're in prison for life, they still are able to network and send orders to their lackeys on the outside. Why keep them alive? Finances are not a good enough argument because bullets are cheap and plentiful.