Head Injury Litigation: Why No NCAA?

Here is the NCAA's stance on concussions.
Behind the Blue Disk - NCAA.org

What I find lacking is this statement:
What is the NCAA doing to prevent concussions? In August 2010, the NCAA adopted legislation requiring each member institution to have a concussion management plan. It also funds studies and informs student-athletes, athletic staffs and sport officials on current prevention and return-to-play measures. It can also recommend changes to Association playing rules to make competitions safer.

The issue I have is I've seen more concussed college players return to the same game than NFL guys. How can the NCAA enforce every recuiting violation known to man but leave it up to the schools to determine how they manage concussions?

For precisely the point of liability and lawsuits. If the NCAA has recommendations and guidance for the schools but doesn't actually require the schools to do anything - it's then on the school if concussions are mismanaged. If the NCAA instead requires the schools to do certain things and those things may be shown to be harmful or at least less effective than other measures that should have reasonably been required, the NCAA is far easier target because it was the one that mandated how concussions were managed.