Originally Posted by Niles Crane

Growing cannabis was his concious decision. Burning a flat down in the process wouldn't be, it would be an accidental occurrence. One which isn't guaranteed to happen when growing cannabis or only achievable by doing so. I highly doubt the likelihood of this happening by growing a small amount of cannabis is more than having a few more electrical appliances plugged in either.

By such logic, if somebody accidentally falls down the stairs and dies you might as well say "It's their fault for having a staircase". Having a staircase is a decision. Walking down the staircase is a decision. Falling down the staircase is not.