I feel for Mr. Crow, he's not the target that we should be watching but how many of the folks who he trained in his protestor's school might have gone on to more radical forms of civil disobedience. While small, there are groups that do see that the goal justifies the means, and like the Thatcher Government said while I lived in Europe, 'We have to be on the spot all the time, they only have to succeed once."
I know of cases of Arson that was tied to eco-groups. One went as far as to set two sets of bombs, one timed to go off 20 minutes after the first set. These were laced with nails and debris. That was for the first responders. The firemen, ambulance and police.
It's a terribly delicate balance between vigilance and oppression and I've seen it tip out of sorts too often since public opinion turned against individual rights after 9/11.
"Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. " Ben Franklin