They will absolutely have to change quite a lot about that plot because the "dark side" has to be tempting, that's the whole point.
And there has to be a whole lot of tempting in this case because they want you to
side with height challenged little shits to wipe out a refugee camp
which is just a cartoonishly evil act. And
at the victory party after that massacre, one of these little shits hands you the bloody and broken lute of that cute as a button Tiefling bard that is just about the only character in the game so far that hasn't been a total asshole to you, to really drive home the point of how much of a fuck up you are.
There has to be a SHITLOAD of incentive for me to do something like that.
