frogwoman
No amount of cajolery...
Examples would be useful.
I was on a psc stall/demo in 2009 in a town centre of a local town and we were giving leaflets out and getting quite a good response until a group of people came down and joined the demo and started shouting religious/political slogans like "god is great" etc. The organisers of the demo didn't do anything to get these people to stop saying this stuff, although we asked, and people who had previously took our leaflets etc started walking past quickly and avoiding us like the plague
that's not the organisation's responsibility, obviously, but one of my main criticisms of psc is that they tend to allow absolutely anyone (and i mean anyone) to join, handing zionists etc a propaganda coup
I also think some of the imagery/signs on various palestine demos i've attended in the past could be look a bit dubious (star of david = swastika etc) to somebody who isn't familiar with the conflict, to say the fuckin least
obviously, that isn't going to convince people to become a zionist, but it may have the effect of people who may be sympathetic a bit more dubious about becoming involved etc ...