Not at all - Even if wannabe traitor's wanted to help Zarqawi there is no plausible way for them to do so (directly). In terms of keeping him aware of our tactical Ops on the ground -
Since they are keen on killing / intimidating those that are seen to be working with us, we should let slip a list of people we would like to see disappear and let Zarqawi think they are helping us.
Also, if the people that are seen to be helping us are such targets, we should watch some of them to see who is trying to intimidate them.