No one is equating anything. But I think you understand this, you’re just being dishonest.
Answer me this: If a murderer is tried and goes to prison, do any of the prisoners (or guards for that matter) have a moral right to kill him if they feel like it?
Murder is a really bad crime, right? It’s certainly not stealing a bag of chocolates. If someone murdered my friend, does that give me a right to kill any murderer in prison I want to?