(Washington, left-wing activist, forest fire): https://www.kiro7.com/news/local/police-arrest-puyallup-man-...

(Oregon, arsonist, forest fire) https://thepostmillennial.com/arsonist-arrested-after-using-...

I haven't found the trifecta of ('Oregon', 'Left-wing activists', 'forest fires'). But I wouldn't have written an article making a claim that it definitely didn't happen. "falsely claimed" and "debunked" are unjustified claims themselves.

We are living in a strange time where many people think they know more than they do.