The concept of minimum necessary force (MNF) is one which many libertarians accept, but few can defend. There is a right amount of force for a situation. In the limit, the minimum right amount, maximum right amount, and right amount are all the same. Not in the limit, MNF means erring on the side of using too little force. But why do that? Why not err on the side of too much force, to be sure we get the job done? Or better yet, not err either way.
And don't tell me MNF is right because it's self-evident, or I will have to WRITE BIG CAPITAL LETTERS AT YOU. mwahahaha!