Their actions were not non-violent. Credibility lost for them right there.
Prairie
When left-wing ex-communist scum like Ken Livingstone (the mayor of London) criticise F4J then you can be sure they are good people with a worthwhile, albeit politically incorrect, cause.
P.S. Their protest also highlighted the lousy security situation in the House of Commons, which could have been exploited by an al Qaeda nutter rather than a harmless domestic protestor. But no one in the media seem to give tham any credit for that.