Their knives are out for everyone who gets in their way.
If they’re out for Barr, Barr is in their way.
Barr was, but is no longer in their way. There is nothing feasible to do unless they wish to attack him personally or those he loves so the next poor schmuck AG might be more malleable to intimidation.
The hands of time cannot be turned back, of course. One can't usefully cover barn pit back up after the calf has drowned.
If the DS made such a play, all hell would break loose on the Rockefellers, Rothschilds, and the other 11 families.
PDJT has already been put on notice to such extreme coercion via deadly threat of the most modern kind. We can be thankful he is made of the sternest of "stuff" and his security is second to none.