[dragonwriter]

> The domain experts could be cops themselves, in a specialist department of a broader police force. I'm sure a lot of the basic training and equipment required is the same across agencies.

To the degree that that's true, the basic non-domain specialized training is already shared. [0] There are also, I believe, jointly-developed shard equipment standards and mutiagency equipment purchasing. Even if there weren't, you don't need to put operational authority in a central LE agency to achieve that.

What is the specific benefit to be gained by centralization?

> In any case, the current hyper-local US system for both police and other services is disastrous in practice for many groups of people

A specific argument on this point, particularly about how this is relevant to the subject-matter division of federal agencies rather than the territorial divides of city/county/state general-purpose option policing agencies would be welcome.

[0] https://www.fletc.gov/learn-about-fletc