Why would you even believe the opposite? US spooks have been amassing vulnerabilities and relying on them for decades, they literally pioneered it in the 90's if not earlier. Everyone does it now but the US is the biggest of them all. Surely this devalues a lot of what they did. Moreover, the way the US government handled new capabilities, and OpenAI's training policy (they are in bed with the government) just scream "we want to create weapons for cyber-offence and deny them to everyone else"

It might not be the reason, but of course it's a contributing factor.