Itlan, you're thinking how to prevent catastrophic failure which is a good point -- but a lot of people are likely doing damage to themselves over time by slightly improper form. It's easy to peruse r/fitness and the other assorted subreddits and find tons and tons of people talking about lower back soreness from squats. Some of that is DOMS, some of that is "has the flexibility of a wrench and just jacked his shit up because reddit told him he has to squat to be strong". I think I'm fortunate in that I had no preconceived notions of my own strength so I started with very light weights and moved slow... and I also had five years of USMC PT that likely built up my core/lower back and helped with flexibility.
I know for sure that ALL of my non-active civilian friends have HUGE mobility issues; they can't even perform a bodyweight squat properly. Can you see the problem when a guy like that goes out and buys Starting Strength and decides he needs to back squat from week one? I'm not talking about ham planets, either, I'm talking about the 6'1 175lbs computer nerd who decides 2015 is his year and wants to put some muscle on. Heoughtto spend a month, minimum, on flexibility and conditioning shit (pushups, planks, air squats) but that isn't the likely progression route.