For the sake of avoiding repetition I see as needless, I believe I have answered this post in the following thread;Jesus told: love your enemy. This commandment has very positive effect, it translates as: "execute your enemy only if no other means can be applied. And only the court has decided. Do not execute your enemy without approval of the court." This commandment has saved from execution tremendous amount of lives. So, this is not mistake of Jesus.
List of Jesus's mistakes, please.