I definitely did not say or imply anyone should "leave it alone". I said live ammo is not a solution, in my view. I'm OK with bringing in the NG, the look fairly imposing in their riot gear and can "man lines", they don't have arrest powers, the do free up local police who do.
I don't think Marines are needed in this situation. They have very different training and warrior ethos. Their aim is to win battles, using deadly force.
There was a story, perhaps made up, that a policeman ordered some Marines "Cover me!" and the Marines lit up the area, which astonished the policeman, who thought it meant "Be ready to fire if something shows up". To a Marine, it means lay down suppressive fire.