Personally I'd do it and just be professional. As a maybe slightly strange example (but it was the first one that springs to mind) imagine being a Doctor in a prison and being asked to treat a serial killing prisoner - you may not like the surroundings or even want to treat the guy but you do it as a professional and leave emotion at the door. In a time when jobs are scarce (I'd go anywhere!) I'd be leaving emotion at the door! but that's just me.