The Feds don’t have the resources to handle local law enforcement, even if they wanted to. I can’t see that this is a way for either party to pick up a bunch of votes, so interest is low.

Never is a foolish frame, if you're talking about real politics in the real world.

> It's the basis of the entire system

No, it isn't. The Constitution is the basis of the entire system, and it defines the powers of the Federal government. The 10th amendment says:

The powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people.

The conclusion of the data you provided is in agreement with my statement.