It’s important to remember that capital punishment is the flip side of gun liberty. Leftists who oppose one generally oppose the other, in their quest to preserve the lives of violent, predatory and murderous criminals.
Gun liberty is the common man’s capital punishment, while defending himself, his family, and society as a whole. As such, lawyer’s tricks, endless appeals, squishy judges and weak politicians cannot stop a bullet from ending the life of a savage menace, a rabid dog, a violent psychotic, or someone reduced to being a vicious animal with drugs and alcohol.
Since to a great extent, the government cannot bring itself to protect the citizenry from such monsters, the citizenry must do so themselves, despite the impassioned pleas of those who act outside of reason or common sense, for weird political philosophies and religious beliefs.
It is wrong to conflate self defense with vengeance, even though the common concept is to continually do it. Such a conflation starts a slippery slope, leading to ambushes and enticements.