Are these the same people who do bicep curls in the power rack? Coz my gym has a few of those..... argh..... it's annoying when you want to use the rack for what it's intended..... there's loads of space for curls outside the power rack area.....
I'm lucky, my uni gym has a policy of asking members who want to use the free weights gym to attend an accreditation class where they teach you the proper form for squats, deads etc and if the trainer isn't satisfied you can squat properly etc without injury you don't pass.
It keeps the current newbie fresher not serious about exercise invasion away in the nautilus room and all the beginners in free weights (like me, a few months ago) are serious for the most part. Except for the creative uses of the power rack....