I explored what you presented and there seems to be a good chance that one person who had been arrested might also be a BLM supporter.
He is NOT any BLM leader in Portland.
I didn't say I knew all the causes of the fires. I didn't say that NO PERSON was culpable.
I said-- 'NO WAY did the BLM Leadership cause THIS'
And I was correct.
FYI: Not sure why some random tweets or facebook pages qualify as anything more than opinion pieces.
And yes, if the police have rumors called in, there is still an obligation to investigate so.. yes,

that sort of thing might be found on a scanner. That's a part of investigation, not fact. One needs a court for such matter, not a cop- sorry!
As for that one dude who happens to support BLM, you aren't actually using the fact he supports that as a justification that he acted on BEHALF of the movement, are you..?
I mean...IF you'd do that... if anyone did that, it'd be a false equivalency, a logic fallacy, where two unrelated things which are coincidental are used to fluff a disagreement because there's a desire to make someone or something look worse than it is, right?
Just like Florida Parkland mass murderer Nikolas Cruz is an ardent supporter of certain people and policies...

Would that mean what he supported or who he supported would have been okay when he shot and killed 17 people..?