That's what Im trying to figure out... mine is actually really sturdy. Not sure if its because I'm using the heavier bases and thicker pipes (I have 2 inch tubing), but a lot of force would be needed to make that budge. And again, seeing as your booth was designed for 2-4ppl I think our dimensions are different which made yours tighter and the poles and drape more within reach. The drapes themselves are free flowing on mine, so it would only be the corner poles themselves that a guest would have to hit to take the booth down... and those arent really within arms reach with exception of the one near the entranceway... but they're also standing in front of it since thats where the backdrop goes... so theyd have to go out of their way and turn around to touch it.
Either way... I think the key thing is the actual attendant. Events over 250 I actually have 2. They are always watching the behavior of the people to make sure everything is flowing smoothly. Weddings tend to be more open air as opposed to enclosed, but still can't say this has ever been remotely close to being an issue with my booth.