I'm not sure MON is dangerous, but its obvious that when you take that job, it's part of the deal that you don't bad mouth their support. It's another reason their choice of managers is limited.
The problem starts at the Board level, and that feeds all the other parts of the club.
Graeme Souness is the only manager I can think that has taken any sort of stance, and while he shook things up by signing players from the "wrong school" he still didn't go as far as condemning the bigotry.
Unfortunately for the sane fans, and unfortunately for Scotland, the sectarianism is good business for the media, so they will continue to take advantage of it for the forseeable future.