I’m pro death penalty for treason, spying, terrorism and related crimes , and anti death penalty (mostly on scriptural grounds) for ‘common’ crimes like murder. I do think that shooting or guillotine are probably the best methods. I’m creeped out by the fact that lethal injection seeks to disguise the execution as a medical procedure.
Death by shooting, if it’s done like the Soviets used to (single shot in the head) can be quick and presumably relatively painless.