Well ideally, the minimum necessary use of force is zero. The problem is, we don't get to set that value. Our opposition does.
Bitcoiners already are playing a force game in hashrate. We just have a single social rule that the force will be wielded electrically, not kinetically. It's that use of force that allows for permissionless spending at all.
If we can get our opposition to play that same game, then everyone wins. If we have enough force capacity to convince our opponent not to fight us, then eventually everyone still wins. What I can't accept is for us to lose, because we would rather lose than kill.