We may be off the mark here. I think a swastika or noose is placed on their doors as being representative of what these profs are doing in universities, i.e., indoctrination, just like the Nazis and the KKK did to the youth. The ‘real’ hatred is shown everyday in the classroom by profs when speaking about America, religion and conservative values. The profs are the fascists and some students want it to be known.
The real problem is the Amish sneaking into NYC from Pennsylvania in carts with rubber tires draw by horses wearing rubber slippers. They impersonate Central Park horse-drawn taxis...... 8~)