I think a review for intent is inherently an exercise in futility. And unless grievous enough to demand action to prevent being overrun by public opinion, players aren't going to want the NFLPA to push for more investigations. Perhaps a case could be made to conduct interviews in all cases, to get people on the record.

But I would actually prefer they pursue this:

ProFootballTalk ‏@ProFootballTalk 33m33 minutes ago
Pacman's helmet antics were preceded by a throat punch from Cooper (but Jones still should have been suspended) http://wp.me/p14QSB-9R5Z

I can see a player argument for getting the details right. Not all sources of conflict can be verified, but if you've got film and it wasn't called on the field, there should be a FedEx envelope at that player's locker on Friday.