The quest that really made be feel bad was killing Mr. House.
He sought to renew humanity, put it back on the tracks, and take us to the stars and beyond. To rule the world to prosperity.
When I killed him, I felt like a real asshat who had just put humanity's progress back with 300-600 years
Needless to say, when I took over Vegas, I swore to myself I'd make the world even better than Mr. House ever could!
Also,
I must say working for the Legion was quite amazing.
Ceasar was such an amazing character. With goals to unify the squabbling world.
Unfortunately, as his disease proved, he was just a mortal man. Who could succeed him and take on the burden of his legacy when he passed away?
Human frailty doomed the Legion to death since the start