*** Do you really intend the meaning of this sentence to be as expansive as it sounds?***
Can you think of a single example of sanctioned violence in the NT?
I'm looking at it from the other side. Did the Christians who fought in WWII and committed acts of violence fall "from the ideals of the New Testament and [were they] in disobedience to the Lord they claim[ed] to follow"?
The concept of a "just war" has been accepted in most of Catholic and Protestant branches of Christianity. Also while the OT Jews wanted to live in peace with their non-believing neighbors, there were times when God told them to completely destroy their neighbors because their sins had become so gross that they would bring down the spiritual sensitivities of Jews.
Yes. But only one, and it is not meant to be used as an excuse for others to commit violence.