I think following the example of Christ is the right thing to do. Peter was willing to take on the Roman Army and Jesus stopped him. If He had not stopped him, I don’t think Peter would have been around to be the rock Jesus needed him to be.
As for what do you tell your grandkids, tell them to ask their parents what happened. If we’re around to tell them anything.
You can pick and choose scriptures to prove anything you want. The fact remains, at the time Christ stopped Peter and the sword...it was a key moment in Christ fulfilling all that He was sent to do.
God used violence often - and he sent us all 66 books to review. Paul used sarcasm, logic and debated very passionately in the years after the incident you cherry picked. If God has called you to do nothing politically (and that may indeed be the case) - please don’t assume we all have that same following. Such would be to totally IGNORE why God used “the body” as His analogy.