Ultimately it's a very simple concept. Either you:
1) Decide what's good for others, and forcefully apply such life on them (violence)
2) Don't (non violence)

I prefer to never pick 1. You're saying "Well, 2 will never work so let's pick 1", or in other words "Well, good will never work so let's pick evil."

If you're gonna pick evil, you better have a REALLY GOOD excuse for it, or else I'm gonna put you in the same basket along with warmongers and violent criminals. The onus of proof is on you. Prove to me that the violence you're applying is less than would otherwise occur and you'll be off the hook. Meanwhile, I'll be sitting here not applying violence on anyone.