I do agree that unruly protesters are the reason, but I also realize that there are more factors in play than just that. For example, the outside agitators (i.e., genuine leftists such as Marxists, anarchists, etc.) probably egg on the violent protests because "smash capitalism, smash the state, smash 'racism'" I also count in many internet agitators, such as those who really believe a "riot is the language of the unheard", or hate critics for "riot-shaming", found in the cesspools of liberal subversion and decadence (such as Tumblr.)
I do not believe, however, that the police militarization has anything to do with the looting. There are rioters, looters, arsonists, and anarchists about in Ferguson, the police must gear up accordingly to deal with the scale of threats that those forces pose to themselves and to the community at large. If those throwing rocks at the police, breaking their ankles, and yelling "NO JUSTICE! NO PEACE! FUK THA POLLEZZ! HE DIN' DO NUFFIN'!" complain about police in riot gear, they are clearly the collective that has successfully completed the greatest act of having the complete lack of self-awareness known to mankind. **** them, I support Ferguson PD 100%, I hope they crack open a box of Stingball grenades and OC Paintballs.