I'm not sure why you would think they are climate deniers. The odds are that they are exactly the opposite.

Having been around far left activist groups in my past, there are many who think that doing things like this on purpose is morally justified, because it keeps the conversation on climate change. The media incentivizes it by covering them as "climate-fueled wildfire" stories, every single time.

Wildfires in Canada were at a two-decade low in 2020, during the lockdowns. Think about that.