War shows who is who and which spirit leads the mortal heart. Jesus gets thrown away--every war--but by--the FEW who know him.
Let's say you have a child that is in danger of being killed by an intruder, and the only way to stop this is through the use of force, including possibly deadly force, would you do it or just let your child be murdered?
Secondly, Torah and Tanakh state that we have an obligation to try and defend the helpless, and I assume Jesus well knew this. So, I guess I have to ask whether Jesus would ignore the Law as found in Torah that was given by God according to the Torah itself? Why would God supposedly change His mind?
I think that Jesus general direction on this was to encourage us to try and be more peaceful, not to abandon those who may need our help. I also think that it's likely that Jesus' words of peace may well have been especially aimed at the Zealots who were willing to kill Romans in order to try and liberate Israel.
The early church well knew that this was not a simple issue to deal with, and at the end of the second century it allowed its adherents to work at policing, but short of being involved in war.
There's a difference between being a minority group versus a majority group, so when Christianity became the norm in parts of Europe starting in the 4th century, some roles changed, and this was one of them. IOW, the conditions of "the Way" when Jesus and the apostles were alive was quite different than what was to occur later when Christians became a dominant force that now was in control. Thus the church struggled with this, eventually settling on what became know as the "just-war theory":
Just war theory - Wikipedia
Was it a right decision? I struggled with this question a lot, especially since I consider Gandhi to be my main mentor, and I concluded that it was-- but with much hesitation.