If and when I have to take up arms in defense of liberty, I will be using FMJ rounds for one very good reason. If you kill the person you shoot on the battlefield where they fall, the enemy doesn't have to expend any more resources tending to his wounds. But, if I incapacitate them, the enemy must take more people off the battlefield to care for the wounded personnel. Usually for every one injured, it takes four more to care for them. A medic can't shoot back if he's busy applying a tourniquet or a field dressing; now he's a sitting duck. It takes 2-4 people to bear a litter and take the injured to an LZ or RP for evac, and I know from experience you cant very well aim and shoot when your carrying a litter. The time it takes to drop the litter and assemble into a combat formation is enough to pick off a few more.
What I've just described here is exactly why our own government would have a very difficult time fighting a war against its own people. They trained many of the very people they would be fighting in the very tactics they would use against them, and the number of veteran forces outnumbers the number of active forces many times over. It wouldn't take long for a rebel army led by veteran officers and senior enlisted men to train the uninitiated in the basic tasks and tactics needed to mount an effective campaign. Now take the number of people who might not take up arms and fight directly but would offer aid and support to a rebel cause in other ways, and you have a war that our government couldn't win without a scorched earth campaign, and going down that road wouldn't make much sense. If you kill all of the people you intend to conquer, you have no subjects in the end, and thus have no real power. Not to mention the outrage in the international community should it come to that.
/ramble