I don't understand why people jump straight from "this is real" to "this is alien tech"? To me, the public apathy shown by policy makers is exactly the reactio

I don't understand why people jump straight from "this is real" to "this is alien tech"? To me, the public apathy shown by policy makers is exactly the reaction I'd expect to see if there was some top-secret program going on that either has access to the tech or was attempting to replicate tech a non-US country had. In both cases politicians and policy makers would be told by the intelligence community "don't worry, we've got this" and be given additional access depending on their clearance. There are numerous examples of this type of behavior that we know about: Manhattan project, the invention of public key encryption at GCHQ at least by the early 70's (at least 3 years before its public invention) and US Stealth technology are three that jump to mind. Surely a much simpler explanations for these observations is another similar program?