Hot take kinda: Death Penalty shouldn’t exist

Like bro, the murderers and criminals are already captured, tf is killing them gonna do? I get killing a shooter in the moment, but once they are captured, they shouldn't die, they should just stay in jail. At least help them rehab but never let them back into society. I'm pretty sure our prisons are good enough to stop people from escaping jail. In other countries where prisons suck, then yeah I support death penalty.