I went to a Catholic high school and our coaches swore a blue streak at us. It's almost impossible not to swear in a football coaching situation unless it's completely absent from your vocabulary.
Obviously, they want to refrain from it in an official capacity, but that's pretty damn easy to do.
I can see how in some regards, Turner might not have been a great fit with the ISU fan base. I think part of CPR's popularity, outside of first year success, is the fact that most fans feel like he's the kind of guy who you could have a beer and shoot the **** with. The no swearing thing, while definitely classy, could be perceived as a little condescending.