In a village you have just one idiot.

Big cities are a magnet for thousands of them schizophrenic psychopaths.

Always be aware of your surroundings, avoid possible confrontations by changing direction, place or walking pace, never sit right next to the tracks/road when waiting for the metro, bus or to cross the street and if some naked guy is howling and banging his head against the window in your train, don't engage, ignore, scroll Nostr and be ready.