Trying to have sympathy, spoiler

Rating: Null/10 (5 November 2010)

Please forgive me if I have missed the point here, in essence I liked the movie...I like being reminded of alternative realities...I think it helps keep that thought fresh in our minds...to keep questioning the reality we are experiencing..but please help me to understand if I have gotten this wrong.... The whole point ( driving emotional motivation)is for dear Dom to be able to be with his kids again....but after the part about his guilt and manipulating Mal (eventually driven to commit suicide!)was revealed, I lost all sympathy for him and didn't want to see him anywhere near small children...so that kind of ruined the point of the movie for me...although cool to watch and contemplate...
Also...again forgive me if I did not understand...but what's up with two rival businessmen sitting across the plane aisle from one another and no recognition?
Thanks for your help!