Canadian Police are fighting for their jobs, that's all. In certain parts of Canada, they can't even enforce possession laws because the people won't stand for it. Its been de-facto legalized in B.C., for example. The whole "dangerous grow house" gambit is just the latest in a dying cause. Only partially true, the real losers in all this has been property owners. The people who are growing large commercial amounts rarely own the house and are leasing or renting. They come in, knock down walls, rip out carpet and basically trash the house. Once the harvest is complete they simply split leaving the landowner to repair the property. The insurance companies have taken notice and are increasing rates on everyone.
Not really shocking behavior, considering that they're engaged in an illegal activity in the first place. Like I said, its all part and parcel to Prohibition.