Because when intelligent sci-fi stories get put on the big screen they usually bomb. Case-in-point: Gattaca and A.I. Even when they're full of action, if they're anywhere near intelligent, they bomb. Case-in-point: Equilibrium. Good filmmakers struggle to find the "middle ground" between being intelligent under the surface but not overtly. Then they're a success. Cases-in-point: Men in Black, Starship Troopers, etc. Other filmmakers couldn't care less and throw the dumbest stuff on the screen.... unfortunately they're a success too!!! Cases-in-point: Armageddon and Independence Day.