It is true the money is not always spent the right way or on the right things not arguing that fact. Funding maybe coming from the wrong sources but that is better then no money coming in.
Do you really want your taxes not to go to police because you don't use their services? Fine we can do that if you agree to volunteer as a law enforcement officer for a set period of time. That will go over like a fart in church if we enforced it.
Just because you never needed police in your life time doesn't mean everyone else is the same. Same thing for the fire department.
Hell we might as well do it for everything we take for granted. You must work at the following city departments for free at least a few times a month, police, fire, water and waste treatment plants, public schools, utility companies etc. I could go on and on...