Bit of one, bit of the other.

If I open something like a stadium, and whenever there's a big game I need a load of security to deal with traffic, drunk fans, and fights - arguably most of the security should be paid for from ticket sales, rather than the taxpayer, although the taxpayer should be there as the final backstop.

Likewise, if I have a bank with a vault full of valuables and I think it needs 3 armed guards present 24/7 - probably that's going to be at my expense, not that of the taxpayer. Although any bank should get a police presence in a reasonably timely manner, once they raise the alarm about a robbery.