EPA says it will eliminate its scientific research arm

It's really depressing how the US system seems to have existed "on belief". Once somebody set out to damage or destroy it, away it went. Pretty much without a whimper.

As I recall, the system was set up with 3 branches of government in tension. Obviously, that was naive.

The framers noted that the system was vulnerable to a single "faction" [1]. The solution was to have many competing factions. I think first-past-the-post, corporate election influence, and mass media consolidated power into a single faction that ended up causing the system to break down (in that the branches don't seem to be checking each other's power right now).

[1] https://en.wikipedia.org/wiki/Federalist_No._10

The Founders would never have approved of Citizens United.

Yes they would have, for many of the same reasons the ACLU did [1].

[1] https://www.aclu.org/documents/aclu-and-citizens-united