You let the military and police run roughshod, they'll run rough shod over everyone.
As kaywoodie pointed out, next year is the 100th anniversary of the US Army under the leadership of Blackjack Pershing (and the junior leadership of that great American, George S. Patton) riding roughshod over and back across the American border, putting the jackboot to a bunch of Mexicans and bringing peace and tranquility to more than a few South Texas ranchers.
Guess there weren't many libertarians among the South Texas ranchers in those days.
Edited to add: And the New Mexican ranchers. Didn't mean to leave them out.
