Reason is sadism, they like attention first off, and they like molesting passerby with their machine, and they like telling themselves they're superior for maki

Reason is sadism, they like attention first off, and they like molesting passerby with their machine, and they like telling themselves they're superior for making all this noise. And to vindicate, when public speaking a microphone with speakers does feel cool. So there's some innate human trait.