While I agree with you (the peaceful protests in B'more came long before the looting), it doesn't change the fact that the people who are doing the rioting, looting, etc. (thugs, if you will- though I won't) exist, and that's what's happening in Baltimore, and those are the people being called "thugs", not the guy in the photo you posted.
Nolite te bastardes carborundorum.