I don't see random fights. Maybe I'm in all the wrong (or right) places. I do live in he countryside and not the city though.

No yanderes attacking people

You hear about it sometimes but I don't see anything like that and I've been in some dodgy areas. I did witness two drunk salaryman trying to duke it out in a shopping street late one night. The police stopped it almost as soon as it started. Hell, I see more stray cats get into fights than people here. There's also more stray cats than Japanese people. Go figure.