if a murderer should be released or escape from prison
I've never understood this argument. If a murderer is legally released, that should mean that on our best evidence, we believe the offender is unlikely to reoffend, or that we didn't have sufficient evidence to incarcerate them in the first place. In either case, having executed them first is an abomination.
As for the escape argument, saying that we should kill people because the prison system sucks at its primary job isn't exactly the most persuasive line of thinking I've ever heard. (Or is the argument that we should pre-punish inmates for escaping before they do?) That's quite apart from the fact that almost exactly nobody escapes from correctional institutions these days; they're pretty much all from work release or work camps.