People that often bully others on internet behind a monitor was often bullied themself as kids and are extremely insecure, unhappy and sad.
So instead of change their life to the better they go online and spread the hate they have inside them on innocent people.
That's how it often is. But we all knows about this "The loudest one in the room, is the weakest one in the room.”*
But regarding suchmoon I got no idea.