Ok, so in the TV show Stargate SG-1, the Stargate program is an Air Force initiative to use an ancient alien device to send teams through a wormhole to planets in distant reaches of the galaxy where they interact with aliens and humans from other worlds.

One of those humans, having become a refugee on Earth after losing a war to aliens, creates a television show which essentially "files off the serial numbers" of the actual Stargate program.

When the Air Force learns about this, they allow the show to remain on the air, because that way if the story of the Stargate program ever leaks, anyone who hears it will dismiss it as the ravings of a fanboy who got too into the show, or of a conspiracy theory who can't tell fiction from reality.

So the first part is, I think that the US Government could totally be using this to hide something really wild. Maybe there actually is an Upside Down ("oh really? Like in Stranger Things? Suuuure.") or maybe aliens really do exist ("bro, you've been watching too much X-Files.") and maybe not only do they exist but they've formed this whole secret subculture on Earth ("dude, that's literally just the premise of Men In Black.").

But see, now we run into a truly Heller-esque bit of circular logic, because with me even saying that, now the government can just say, "come on buddy, that's just the plot of season 5 episode 12 of a TV show you're on the record as a fan of."

This also helps to explain why Trump and his cadre hasn't blabbed about aliens in the past decade. They were told about the secret government program, but then they were also told exactly which TV shows and movies have been made to discredit the truth, and exactly how the conspiracy would make them look like laughable idiots if they revealed the truth.

tl;dr: superheroes are real, they're way more like The Avengers than you'd think, they have an airtight plan to discredit anyone who leaks it, and "Wormhole X-treme!" is part of the conspiracy