I don't think it's that much of a stretch to consider the human body may not be evolved to support the heavy stresses that many powerlifters subject themselves to (even if they have perfect form) over time.

I believe human beings (mind and body both) have not evolved to handle a culture which values bodies for appearance and highly specific performance, and which values minds for toughness-- which translates as the willingness to ignore "don't do that!" signals.