you know why they did it. "For our safety"
now lets take a break from the bullshit. The reality of it is, winter is a low season for tickets, people dont tend to speed thinking there is ice around, modified cars are away for the season, so where do the police make money? Oh, winter tire tickets, because "All Season" tires dont qualify, it should be a question of choice, not implimentation. They do that enough in the summer months, now we have something to be bothered with ALL year round.
I dont care because I prefer having winter tires, the law is stupid but doesnt affect me.