I mean with all the shit that world governments are constantly pulling it really wouldn't surprise me at this point.
Like whistleblowers disappear all the time or are labeled crazy people.
Imagine a govt employee suddenly ranting and raving about aliens or extra dimensional beings. Even if he had proof it wouldn't be hard for the govt to make him look like a crackpot or make it seem like he had a mental breakdown.
Edit: Y'all I'm not saying I actually believe this shit just that I wouldn't be surprised.