Do you scream it in the middle of a crowded square 10 times a day? I do not think so.

Anybody randomly screaming any phrase in the middle of a crowd is either an idiot or unstable.

Besides, that specific phrase is commonly used by terrorists to announce they're about to detonate. If instead they said "I FUCKING LOVE YOU ALL" or "JELLY BEANS" before bombings then I'm sure they would treat that phrase being screamed in a crowd the same way.