Assume? Townies are not being killed at night are they?
There are three town protect roles--doc, jailer and body guard. Since the body guard is alive, one can assume the doc or the jailer could either be the one that is the reason there are no night kills thus far, depending on who is jailed or who is protected.
Given, however, the discussion so far, it just rings like a really bad gambit.
If the cop hits on the scum roleblocker, they should come clean because against a GF they would then be no more valuable to than a VT because of the false results the GF gets. Otherwise, IMO, town PR's need to not do this claiming stuff. Even if we knew for certain who all the PR's are, there are still way too many people in the game to have a coordinated strategy that would cover all the possibilities. As ironic as it is, we do have too many vanilla townies at the moment getting in the way of a power move by town.