Librarians, sure. You ever face someone who's livid because they "never took that out" and "I don't even have a library card" and who, when shown their application for a card with their signature on it claims "you forged that!"? Over a fifty cent fine?
Ever cleaned up poop that falls out of loosely worn diapers or Depends? Or a public toilet that someone with diarrhea has made unusable? Or the blood from someone who yanks off their bandages at the checkout desk?
Ever been threatened with a knife simply for standing at a desk helping people? Or found a used condom used as a bookmark? Had someone collapse in front of you (we have an AED in the library)? Had a police sniper shoot someone dead in a hostage situation you were involved in (as happened in the Salt Lake City PL)? Or been working in a building when a backpack explodes (SLCPL again)?
Exhibitionists, drunks, and the mentally disturbed are simple, common problems.
I could go on...but libraries and especially public libraries are viewed by many as places as nice as Canada AND are run by little old ladies who can be intimidated by a withering glance and the word "damn". Little do they know that librarians climb rocks, whitewater raft, engage in shooting sports from sporting clays to archery, hold top ranks in the martial arts, are ex-cops and ex-combat veterans (I know of three who jumped with the OSS to work with various resistance groups in WW2 and even more who fought in 'Nam), quilt, have children, can program in several computer languages, leap tall buildings with a single bound, and run a multimillion dollar library system with a multithousand dollar budget.