I'm no fan of police, and I support protest groups - but there's a difference between protesters with a grievance, and hooligans looking for an excuse. From what I've seen, previous BART protests have been more the latter than the former.
I am sick and tired of "anarchists" subjugating every legitimate cause under the sun so they can have an excuse to deface and destroy. Not only is what they do juvenile and unproductive, but their presence taints what are otherwise very legitimate and important grievances and seriously compromises public opinion and support of these causes.
There is not a single group I despise more than your average black bloc "anarchist protester". I'm disappointed (but unsurprised) that Anon has confused real protesters with these guys, too.