Sigh
It is not an exact quotation and MJB never said it was.
It does sum up biblical principals when it comes to dealing with evil people.
There some people in this world that are pure and they have to stopped and that is the context of what he was talking about .
He was not talking someone getting angry and mouthing off a threat to kill and you kill him for that .
That link to the article I posted to you it’s a really good article and you should read it because it makes great points about dealing with evil people.
As Christians we can not make excuses for evil people , there are some people that must be dealt with and passivity doesn’t deal with them. When evil men(or women) are let run rampant and people make excuses for them you end up a society like the Palestinians . Evil men run that the land they live on because the world rewards them . People who live there and speak against the wrong they do are drug behind cars through the streets , they are beaten and murdered , meanwhile their society becomes worse and worse and they start teaching their own children to be murderers .
Read the article it makes great points , really .