The real issue, is money.

Which is the cheapest alternative, to getting the job done?

Use the police?

Use peace officers?

Use armed security officers?

Use unarmed security officers?

Use the TSA, who do not really have security officer status?

Who can get the job done, at the cheapest rate?

The strategy, of using a Chinese restaurant menu selection, is the current strategy.

Using just the Police, will cause a problem.  The Police don't usually perform, all of the security functions, as part of their normal job descriptions.