I need to tell someone off
But do you really? What would be different if you did vs didn't do that? If someone does something to harm you in some way, think about never trusting them again and/or limiting or ending all communication with them. Believe it or not, some people enjoy getting an emotional rise out of others, and you run the risk of giving them that. What drives people like that crazy is getting nothing from you
I think you're right to be suspicious of everything right now. This article at least frames most of this as speculation. The groyper stuff seems a bit harder to dismiss, since the FBI decided to release evidence that really makes that case, despite them trying to frame it as "antifa."