-I'm with morfort on the whole "I didn't have much of a life to begin with" thing. Well, I guess I would still be depressed to some degree, but at the same time I've always been an optimist/hard to depress so maybe a total collapse of a part of my life philosophy? That would probably send me spiralling into some sort of nihilistic mood. Add that with my already existing Machiavellian tendencies...
-If my life was ruined and my parent's captured I'd probably have more important things to worry about than my house being destroyed. Still, I guess I'd miss everything that I had. But still, I would hopefully be more concerned about everything else that was going on than my house.
-Well, theres one advantage of my mom living in another state; it would be much harder for them to get them all at once. However, I'll admit that I'd work with the Animorphs to get them back and then "Bye-bye Animorphs. Have a nice life." Of course then there would probably be some big fight that leads me to having to work with them to save the world. Or guilt comes in or something else sends me back to fighting with them.
-I'm not going to answer that one because I cannot honestly think of how I'd react to fighting an intergalactic war. In my mind right now I'd probably just not try and moralize it past the "your the invaders and we are trying to get rid of you" thing, but once I was actually in there I'm sure something would change.
-If they are part of the only group I can ever be in again, well, I better hope I'm not an outsider for long. Though I would probably get into some arguments with them (hopefully they can understand I'd be a bit, well, testy).
...wonder if Tobias knows any nice branches I could live on? Being a nothlit would be my last resort.
Overall I don't think I'd go David's way, but I probably wouldn't be that effective of an Animorph so who knows what would happen.