Getting rid of the Parade mentality while riding in groups seems to be hard thing to do. The one possible reason why someone that "knows better" becomes a lemming when it comes to doing certain things while riding with a group could be they may actually become a hazard if they do things correctly. For instance; if everyone addresses a stop sign with a rolling stop (most of us consider that to be a yeild motion) then one rider unexpectantly decides to come a full stop (which is out of format for the group), they may just have a couple of bikes racked up on their rear fender. So unless the group has a pre ride meeting and addresses items like this, it may be "safer" for a rider to do an unsafe action, even though their intital action was correct and the others would certainly have been at fault.
Two ways that could help prevent the lemming approach: 1- explain the groups riding guildlines with as much detail as possible (should really take about 10-15 min) before heading out. 2- Do what others before have stated, ride with a couple of folks you know & trust. And the one way to really prevent it - Ride solo and meet them at the destination either a little earlier or latter. | 
To stick it to the man. 
You know. Screw it. Lets ride. 
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