Having gone to some FReeps since 9/11, I agree. They have gotten bolder and the PLOers (imo) have gone from the back of the pack to being at the forefront and their "way of protesting" and denial of freedom of speech by others (meaning pro-America/pro-Israel) is becoming ever increasing apparent.
In my past encounters, the only serious trouble was with union goons, who were self-appointed(or not) marshalls for the commies.
The Liberal Party in Canada had mob-connected Teamsters serve as 'ushers' at their major rallies, just in case there were any dissenters.
You can't afford to lose the battle for the streets; you can't allow the leftists to intimidate you or the game's over.
Guns are not required, just resolve. ;^)