If you're still reading, you're a DFH. Respectable people who try to change policy aren't called activists, they're called lobbyists and donors.
Are you wearing a suit? Doesn't matter. Have you been working peacefully and professionally towards your goals? So what. Are you a law-abiding citizen who's trying to engage in a participatory democratic process with people who are making decisions about your future? Big whoop. Did you cut your hair, put on a tie, get a job? Sucker.
The governments of the world and the United Nations would like you to know that if you're too sympathetic with the oppressed, care about democracy, and value people more than money, you can go ahead and do absolutely everything right like we told you that you had ought to do.
And we will still punch you in the face.
Photo credit and note: Kris Krüg on Flickr. See the red stripe near the man's suit collar? Other photos clearly show it's a UNFCCC delegate's lanyard, which means the man holding up his hand in self-defense and getting punched in the face by police had to pass the registration security checks, register at the Bella Center convention hall in person and to have been issued a valid COP15 badge.
Witnesses have reported that the man had been inside the convention at least most of the previous week, and there had not been any reported security incidents caused by alarming attendee behavior at Bella Center before the NGO lock out. We were all, apparently, just a bit too unsightly to have around when actual heads of state came to Denmark to do our business.