Having spent 18 days there myself, I agree with you. Also, if you're writing a letter to an inmate, don't write it on the back of your 1993 Gary Larson "The Far Side" page-a-day calendar. Some of the screeners will assume you've dipped them in LSD or something.
But atomic, if someone sent a fax to a prisoner, then somebody would have to deliver it to the addressee, and that means someone would have to get off their ass and do something. Can't have that, now can we.