Joe is nasty, but they can rid themselves of him the same way they got rid of Jack and blame the usual suspects (no longer Communists, but White Supremacists), and use it to push for civilian disarmament, any time they aren't getting their cut. Bobby's assassination was the excuse to push the GCA of '68, and they'd use the same pattern.
The one they are trying to shut down is RFK Jr. because he sees through a lot of this crap (they are already calling him a "conspiracy theorist" and 'anti-vaxxer nutcase--even though he hasn't said anything not borne out or at least apparently supported by evidence--to try to marginalize him). And Pharma keeps buying that ad time.