Actually I consider most people who take the time to attend protest rallies at abortion clinics, recruiting centers or prisons to be extremist nutjobs.
Sure, Berkeley has more than its share, by far, but the other day I saw a news clip about how the treesitter protestors who have been in the trees for months are losing their resolve...it seems there's a counter protest group of very vocal students who show up to chant and taunt the tree sitters daily, and one student was even selling rocks to throw at the tree sitters....it made me chuckle, anyway.