So what if they're not important? Even if only the maid, stableman, and the owner's daughter remained on our side, and there were zero on the mafia's side, it would still be a victory. You can win even if all our "tanks" are eliminated.
But what if the mafia remains?
Agree, it would be much better if the Paladin, Healer, and Ranger remained against one or two mafia members, than the peaceful lineup you suggested ;)