The Falmer's story is a sad one, betrayed by their own cousins the Dwemer in their time of need, Enslaved and blinded. However they're a real danger to Skyrim now,
Don't get me wrong... I'm not saying I won't kill Falmer, of course I will, but my attitude to killing them is like a vet that must put down a rabid dog.
I take no pleasure in it and I feel no hatred towards them.
Killing them is, in a way, an act of kindness and respect to the Snow Elves legacy.
As for the Forsworn... maybe betrayed was the wrong word but look... when they took the Reach they killed only very few Nord landowners and then ruled the area in peace.
When Ulfric took the Reach back (contravening the WGC at the same time in his deal with Igmund) who did he kill?
Oh yeah... EVERYBODY he could get his hands on, even after the Reach was well and truly taken.
The Forsworn are no more despicable than Ulfric, to condemn them with any credibility you also have to condemn the Stormcloaks.
Yes it's a nasty situation, but the Reachmen were living in peace and had no further desire for blood when Ulfric came knocking on the door.
His brutality,
his bloodlust is what drove them over the edge.
Ulfric killed them with abandon because they
weren't Nords... is it any wonder they came to have the same attitude
to Nords?
Every Nord who falls to a Forsworn blade is more blood on Ulfric Stormcloaks hands.
Again, I'll kill them without hesitation if I need to... but I don't enjoy it and I don't hate them.