You only need to look at major national security events in the US history to see the disproportionate positive impact that first-generation immigrants had at every turn.
Far from furthering US national security interests, your "massive reset" would itself be a national security threat.
I must say: I'm genuinely surprised reading this sentence in HN. It's very disappointing.
Do you have any evidence for this? The incredibly vast amount of research work done by immigrants on these visas probably outweighs any risk they pose as these educated people head back after graduating or try to stay.
You're not crazy. You're a cogent individual deliberately believing something that is not true or guided by reality.
This decision will not be beneficial for national security at all, and that wasn't even used as justification for it.