That's what Twitter is for. But when you have practically no followers, jumping on a soapbox to scream politically charged statements goes nowhere. It's emotionally unsatisfying. Same with starting out fresh at a new forum website with post count zero.
But here... Here we have a bunch of nerdish guys and "girls" drawn together with a common love of soundtracks, some for 20 years. It's more of a captive audience and easier to get a rise, which keeps the conversation going and empowers the instigators.