Sorry dude. You killed four people in cold blood, you have no remorse for your crimes, you refuse to inform on the gang you've supposedly denounced. You deserve what you get under our laws.
I don't believe in the death penalty itself, but I believe in rule of law. Under our current system, if exceptions are to be made, they should be made for people who repent for their crimes and who have actually done something to help others - besides write books and say that gangs are bad. Turn in your fellow killers, admit what you did, then we'll talk about clemency.
Doing away with the death penalty itself is a whole other issue, one that for now I'm not going to talk about here.