Then I hereby define the acceptable level of violence as that which it's at right now.
War is over, we won! yay! We can go home and stop blowing all our money on that little country.
Declare victory, bring all the troops home tomorrow, have a little parade and sweep this damn debacle under the rug.
This is all that's going to happen anyway, since there is no way of reasonably measuring victory all that will happen is that at some point in time we will deem it "acceptable" and declare victory and come home. The other side will also declare victory (no one can measure it, everyone can claim it)... but there is nothing that can be done about it.