so why do we have to pay twice for the police?

i have never understood why the police charge football stadiums for being policed.
the police are paid for by our taxes.
football is extremely expensive to go and watch.
so it is mainly a past time enjoyed by tax payers.

therefore the police charge extra when 50,000 tax payers gather together.

thus the portion of our tax that goes on social spending just seems to be for statues no one knows are even erected.