that does remind me of one thing I really didn't like in Fallout 3 though. as is usual for me in games with moral choices, I played with two different characters, one good who wanted to find her father and help, and one evil who wanted to find him because he's pissed off about being abandoned
then you get to
Spoiler:the point where you find your father and the only way to continue the main storyline is to help with his research,
which is completely out of character for the evil character