This is a losing proposition... The last thing we need is for BGs to start using fire based off of what police are doing... I can easily imagine any number of scenarios where a BG simply lights forest fires and lets the wind do the work or any number of other simple ways to light a whole city block.
I think this method should be greatly discouraged. Also fire isn't the greatest way to resolve the issue, it would be relatively easy for a prepared bg to allow the police burn the house to the ground and assume the BG is dead with in reality the BG may have established a underground space that may simply not be effected...
The bottom line for me is we don't want to raise the stakes because there are those BGs who will fight fire with fire.