I suggest you give this a gander. A thousand redneck dipshits with AR-15s definitely changed the way the BLM chose to approach the Bundys. Usefulness in warfare only matters if both sides want to go to war; the BATF could have annihilated the Branch Davidians but opted for perpetual standoff instead. And they've tempered since 'cuz boy howdy you get blowback out of that shit. Yeah - a Reaper is going to make short shrift of the Montana Freemen. It's also a violation of posse comitatus that will radicalize all gun owners in a way that makes Trayvon Martin look like Rodney Dangerfield.
Oh I agree totally. The tactics have changed, but the threat from dipshits with guns has not. A Reaper is going to be used to set up a No Go Zone around a target. So instead of Waco, you have a 13th century siege. Anyone walks more than 200 yards from the building they get 300 rounds of .30 cal from the air. And we all know who wins a stand-off. (Which is the best result any militia can hope for.)