I have no problem with people who are opposed to war. This is America, and the Bill of Rights is still in effect.
The problem I have is it seems like most of these assclowns don't seem to care one way or the other, they just want to cause trouble. They seem like the same professional twits that cause problems at WTO meetings. Nothing says peace and love like
a good old fashioned fire bomb. 
If you want to protest, fine, go nuts. It is all well and good that you don't have anyplace else to be in the middle of a weekday (like God forbid an actual job), but don't keep people who are just trying to get to work from getting to work by blocking traffic.
The other thing is, when asked, the war protestors don't have a clue what they are talking about. They don't offer solutions, they just shout slogans.
"Give peace a chance!!!" When asked "A chance to do what exactly?" you get blank stares, and the faint sound of crickets chirping from somewhere behind their vacant eyes. There is some great video here:
http://brain-terminal.com/video/nyc-2003-02-15/index.html
It happens a lot when the defenders of the undefensable are presented with facts counter to their position. They just ignore the arguments, and keep up the party line somewhere else.
Here is a good example.
Tom