In the case of the 9/11 hijackers - You don't have to believe in hell to go there. Satan believes in Jesus, but not upon him for his salvation. I heard a guy say that hell wasn't bad enough for Satan and It struck me as wrong attitude. I love my enemies, but I don't worship them.
look over here....
If you wanna think the hijackers are sipping whiskey on some heavenly beach fine. I'd be really angry with God if that were the case though.