Why invoke martial law?

. You can have the benefits of an occupation force with none of the pesky insurgent resistance.The only price is our way of life. Oh, I know that's what we've spent the last century and a half fighting wars and sacrificing countless lives to protect. But, really, wouldn't you rather your own government occupy you militarily than some other government? I think the choice is clear.

The photo is from the raid on the Texas polygamist sect. Hat tip to Radley Balko.