They wouldn't. At that point as Vash stated they only can win by winning with the Mafia. To kill the Don would be self sabotage. Also if as Vash also stated they are then in a chat with the Mafia would they not co-ordinate their kill to double up the mafias kill on that night?
Its unlikely in the extreme that the dirty cop was turned and if they were for them to then take a hit at The Don rather than work with the Mafia to kill of someone else.
I think all the talk about the Dirty Cop and what they have or haven't done is an attempt to distract from the fourth Mafia member. They've focussed in on that to point us all towards killing them to buy themselves more time to win the game.
There's 8 players left, we are quite certain that FQ is the Don. We have a second Mafia member left.
Of the remaining 6 townies, we can confirm that we have a Vigilante through game actions, we have a Judge through game actions and then we can confirm through trusting LH that there is a bad cop who at this stage wishes to win with the town by outing the Don.
@VashTheStampede can you confirm that the Dirty Cop win condition means both the town and the DC win? Or does it mean only the DC wins?
If it means both the Town and DC win then
@Local Hero and Dirty Cop I suggest you keep your information secret as long as necessary so that the mafia can't push us into wasting time putting the cop on trial while they pick us off.