It is not the referee's that are the problem
1) Checks from behind are unfortunately part of the game and will occur no matter who refs (CCHA, HE, etc all have multiple check from behind penatly called this year). They happen in peewee's and you still see them happen a few times a year in the NHL...they are illegal, and unfortunate when someone is seriously injured when they occur, but its not the refs who commit the hits...
2) The WCHA officials call the game the way they are told too. Each year all ten WCHA schools along with RIC (ref in cheif) and Dr McLeod and others meet to discuss how the league will be officiated (along with other things). For awhile now, the WCHA has decided to continue to allow the clutch and grab, late hits etc to continue
3) Each league is different and this is obvious if you guys watch HE or ECAC or CCHA games played between two teams from those conferences using conference officials. Other leagues have decided to adopt more NHL/USA Hockey standard of play and the WCHA is just behind the eight ball in adopting this in my opinion.
That is all....Go Sioux