"Foreigners are inferior by definition" - but USA approach says exactly the opposite. Foreigners are capable, so it is better not to share secrets and technology with them.
The US approach is fascistic. Fascism demands that enemies of the state be simultaneously incompetent dolts who could never compete with Real Americans who would be a drain on our resources, and hypercompetent idealogues who would steal our precious resources and send them back to a group that wants to harm us.
I assume the reasoning is if they're so capable, why would they need to steal secrets and technology?
I use "reasoning" in the broadest possible sense.
Exactly, why were these guys wandering around on nights and weekends?