But his private security guards in California don't have 'access to intelligence' either, do they?
And even if armed, they are still private citizens and have no special rights under the law. The same is not true for official police security. By contrast, employees of a private security firm have no privileges above those of any private citizen with a gun.
So my questions remains as to why Harry does not request official security from the State of California, his place of residence. I believe the answer is that this is much less about security than it is about status, more specifically, Harry's largely self inflicted loss thereof.