Why don't Olympic Lifters Squat in a Damn Rack

Watching his Vlog 20 as part of my Jon North appreciation society role (kidding yeh but I do like the guy) I saw him dump a squat and almost get stapled on the way down. Check out 9:38 on the video below.




What I can't reconcile is given the inherent risk in getting crunched under a squat why wouldn't Oly lifters perform limit sets  in a rack for safety. Is it machismo, habit or just plain stupidity. Maybe I am more risk averse than most but for a guy like Jon pushing hard why would you not make what is an assistance movement such as the squat safer??

Thomo

ps watched a guy today reverentially put on his new Oly lifting shoes only to then step on to the platform and perform 6 sets of deadlifts