Countries use a scale of wildfire risk

If there is a clear prohibition to use fire in some location today, because strong winds and low humidity create high risk of wildfires; and somebody still ignores the prohibition and start fire in five different locations in the worse conditions of the year, knowing well that every firefighter is busy yet on one of the other 800 wildfires active, would you still classify that as "accidental"?

Sometimes things are exactly what they seem to be. One barbecue that goes rogue with green level is an accident. With red level conditions, is a crime.

There are many parts of Canada under no fire restrictions at the moment.

Accidental or even negligent does not automatically mean arson. Jumping to that conclusion is silly.