They are all a bunch of potheads and could actually care less about policing costs. They merely want drugs cheaper, but lets not talk about the truth.
It is not about making it cheaper. There is no evidence anywhere that it would sell for less than it does now. It is about removing the criminal attachment just like they did with alcohol.
There are actually 2 ways to go about this.
The first is decriminalization which allows the cops to confiscate your stash and give you a fine but you don't get a criminal record. This also keeps charges such as trafficking and cultivation for trafficking. Many people think this is the better route to take as it gives the ones using for recreation a pass while still punishing the dealers and growers.
The second is legalization. This removes pot and it's derivatives (hash, oil, etc) from the list of prohibited substances making it entirely legal to use, possess, grow and sell. There is a strong movement for this solution with the caveat that is remains restricted, like alcohol, to adults. That means you could still get a charge of contributing to a minor. The benefit of this program is not just the savings on police costs and time but also the govt can grow and sell in liquor outlets for a fair price with taxes. This means less spent and more revenue, a win-win.
Maybe you should educate yourself about the situation and options available before making your idiotic comments.