I'm not argueing that there aren't people that shouldn't be squatting. But there are far too many people that say they can't, when that just can't possibly be the case. I would say, that out of 10 people that say they have "such and such problem" that 8 of them could actually squat and find that squatting properly and regularly would actually help them
now lets watch a 64 year old lady squat
http://www.youtube.com/watch?v=5qBDPP_uhkI&feature=results_video&playnext=1&list=PL402D86308797BC3E
i was doing dead lift machine and squat machine to get back in to it, but it aggravated my back again. come to find out my L3, L4 is now ruptured and needs another fusion. it's not like people with problems don't try. but whatever gets your jollies off man.