There's that, plus the whole "airbags make us less safe" thing where people drive/play like reckless idiots because they think their safety equipment makes them (and the person they're colliding with) indestructible. That has to have an effect too, and especially when it's a 350 lb lunatic flinging his armored ass at your noggin in an attempt to rip it off.
As protection, especially helmets, has gotten better, and the players have gotten insanely big and strong, it might be getting worse. Brains have not gotten tougher. The NCAA needs to get proactive about this as well.
Heck, I feel a little guilty that I still love boxing.
It's because helmets are designed to prevent skull fractures, not concussions, and concussion prevention helmets are normally bigger and not "stylish" so when say David Wright wore won the press, fans and players made so much fun of him he stopped wearing it.
That is a helmet specced to withstand a 100+ mph fastball.