Soft pedal it though one might, this line of faulty reasoning about "someone who was only in the area because of the tar sands" is really just another way of saying the people there did it to themselves, which is nonsense.
Aside from being baseless speculation. People are in that part of the country for all kinds of reasons.
Yes a great number of fires are human-caused, but unless you find specific evidence that's about as far as it goes. I don't recall this sort of speculation going on during the LaRonge fire last year that one of them must have done it.
If there is some specific reason why should be relevant here, I am curious what that is. Like I said, all I see is a not-so thinly veiled attempt to cast blame on that community.