Is murder justifilable?

I think murder should never be an option unless they are on the death penalty for killing someone else. No one should be killed for no reason. The only reason that someone should be murdered is if they have ever killed someone else because what goes around comes around. Killing someone should never be went happens because no one innocent deserves to be killed. If you have some case where a person comes in and hurts your loved ones and you shoot them or if you are in a fight and just using self defense then you will be better off but murder is still never a good result. Tou will or may be put on death penalty and you will be the one ending up in the spot of being murdered, Just dont kill people for no reason, this is my opinion on it.