Plenty of pro-Palestine protesters have targeted allies (or at least uninvolved third parties) in real life, ie attacking pride parades, so unfortunately I don’t see why being on the internet would make things any different. Some people are just desperate to be heard and habitually pick the worst possible way to convince others to listen. Not ruling out intentional shit-disturbers but it’s never only that.
SOH CAH TOA is just a trick to make rote memorization of procedure easier. Understanding the unit circle will let you understand what trigonometry is actually doing.