While this is an extreme case some University are in urban environments. Take GaTech for example, every year someone is robbed or even murdered walking near campus. The campus police usually have to fend off vagrants or drug addicts from nearby.
North Philadelphia isn't the safest place to begin with, but 28,000+ college students fresh out of the nest make easy targets for criminals. There's likely around a dozen "incidents" almost daily. Of the 2 or 3 years I was there, two students were murdered, another committed suicide in the middle of campus, and a few others were shot and survived. The campus police department does its best to make a safe zone around campus with either uniformed officers and/or safety officers on the corners every few blocks outside of campus.
Why does this health problem require police attendance?
Who else is the front line for mental health problems? A medical doctor or psychiatrist isn't going to be on standby rushing waiting for a student to become sucicidal.
Campus faculty aren't likely to be trained on this stuff.
It actually is and is what they are for. Psychiatrists do clinics etc but occasionally end up absent if a call comes through. It's a bit easier if a big hospital for a big city is near the uni however.