Professors are supposed to challenge the thought processes of their students so this is more like a trash collector facing lawsuits for dealing with trash in a way that makes a few people angry. It does students no favors to coddle them throughout college instead of preparing them for the real world where nobody cares if it's inconvenient for them to deal with other people's opinions. College is meant to prepare people for the real world.

It's morally wrong to subject others to unfair lawsuits, as noted elsewhere in this thread in some jurisdictions it's even codified in law: http://en.wikipedia.org/wiki/Barratry_%28common_law%29

It's not awful for me to point out that I see people who are the victims of morally wrong actions being blamed for what's happening to them. Who's doing the blaming just makes it ironic.