I took the quote to imply possible categories like copagandists, white supremacists, Nazis, KKK, or even random apolitical opportunists, which is a distinction with a huge difference. After all, Trump did announce something like "Antifa did it" instantly after the riots started while law enforcement across the board has been struggling to find any evidence. It does smell like an astroturfed misinformation campaign intended to drown out criticisms of widespread systemic police brutality.