What makes everyone say it doesnt help as a deterrent.
I am quite the law-abiding citizen, I just jaywalk alot. If they would implement the death sentence as punishment for jaywalking I will be sure to stop doing it...
All the people that commit crimes that (legally) warrant the death penalty show that it's not enough of a deterrent.
That's a shit analogy. How often do you jaywalk in a fit of rage, or in an extreme case of desperation or panic? Do you jaywalk because you're mentally unstable, either from a chemical imbalance in your brain, or from some sort of psychological trauma?
Killing someone is widely considered to be the number one crime. I don't know how you're supposed to have any faith in a legal system that legally sanctions and commits that very same act.
Putting someone to death serves no purpose whatsoever. Outside of revenge, there's no gain from it and no legal system in the present day is based on "an eye for eye" type thinking because it's both childish and barbaric when taken to its ultimate conclusion. And what if someone is later to be found not guilty, having already been put to death? Try the legal system for murder? They would have committed the most serious crime against an innocent member of their own society. Who then is culpable?