Thanks for letting me know, I Haven't watched them yet.
Ah, jRPGs... I was a console gamer in the 80s and early 90s. At the time, the story behind the original Final Fantasy was paper-thin but you went with it because it was fun to play if you liked that kind of game. Smash anything that tried to kill you. During that time I also played Dungeon and Dragons with others, which was more verbal. If you had a good DM, then you had more ways to accomplish the same task without having to fight and get rewarded for it.
I do admit to being an ass by committing arson against a Tavern as a way to lure people out of the building while we swooped in to liberate them of their vital state secrets. So in order to protect the realm from being invaded by their neighbor, we had to burn a tavern down to prevent the information from getting out. The DM rolled with it. Doing a bad or 'evil' thing for a great 'good' does exist.
How would you handle a situation where in order to figure out the identity of a dangerous up-start aristocrat (who is plotting a coup) you had to make a deal with the devil? Say that this devil lived in a crypt and turned out to be an ancient vampire with 5 other vampires. The offer is that you lure at least 6 people into the crypt over the next month for them to feed on, at the end he would reveal who this 'aristocrat' really is along with evidence. If you refuse, you're allowed to leave but not to return without being killed in sight. The other option is to attack the vampires, but you'll surely die.
You have three choices, the worst solution is leaving because the aristocrat will attempt a coup that could end up costing the lives of thousands. The 2nd worst is attempting to kill the vampires but then you'll die. Even if you somehow 'win', you'll not know who the aristocrat is nor have the evidence needed to have him arrested.
Your only real 'choice' is the dirty one of helping end the lives of 6 people and the ancient vampire will always have that wicked smile on his smug face.
You own it.
It makes for good character development that adds depth and perhaps adds an additional hatred to all things undead and/or manipulative.
I like how you described the scenario it makes sense... although you forgot option number four drop MOAB on them 
