I will be sticking with "nonsense" in this post. Most of the stories I'm seeing could, perhaps would, have been front page on the "rags" next to check out counters. I don't even notice if those exist anymore, and if they're still at the counters, I ignore whatever the covers blare at potential customers. Even if they're so ridiculous they might make me laugh, it's a hard no. Call it mental censorship.
But suddenly the stories are all over the place. Let's start a couple years back with pilots supposedly having video from their cockpits of "TicTac" like UFOs following their planes, suddenly making right angle turns at speed, dropping into the water of the ocean without slowing or splashing. If one could believe them, they'd be amazing, some kind of technology way above us at this point. But... CGI. It exists. I haven't the skills to duplicate that kind of video, but I've seen it in theaters. You likely have as well.
There are alleged brown skulls that have the huge eye holes in the face that would do any alien-party role player in Roswell, New Mexico proud to wear... except it wouldn't fit over their heads. Thank goodness there's flimsy plastic white ones for sale there, eh? Meanwhile, I look at those photos and think "movie prop." Any human with the skill set and a streak of mischief could have manufactured one. So, proof of nothing alien, unless you judge the mindset of such a designer/manufacturer to be "alien" - to you at least. Maybe not even so alien if making it came with the right price tag. I bet they could do T-Rex skulls too, or super giant King Kong ones. Heck, I'm sure they already have. We've seen those movies too.
It used to be the stories were about abductions and surgeries to find out the internal anatomy of helpless victims. Somehow those folks always managed to arrive back on earth, a "big chunk of weird", but somehow scar free and with a deep thirst for whatever was served in the local bar... on somebody else's tab of course, since telling long stories is thirsty work.
The flavor of the stories has morphed again. The most recent ones are alleged to be from some previous administration's has-been, spouting secrets about how jets at 40,000 feet are stopped and held stationary for a bit before being safely released to continue to wherever. Or our moon walking astronauts either never arrived but the "proof" was set up by resident moon aliens who somehow knew how to get all the details right, or our astronauts did arrive and were being observed by aliens while hiking around on the moon. No doubt those aliens were waiting to see what was going to happen to the neighborhood now that some "wrong color" new neighbors were starting to show up with big reflective heads, and wondering how they'd affect property values. Was it time for them to move further out to the suburbs... of Mars?
Conspiracy theories abound around these stories. Maybe they're waiting for us to overheat this planet and make it perfect for their next colony? Or they're in league with (pick an enemy, real or fever dream) and will reveal themselves as they start to round us up for dinner - theirs, not ours. Maybe they have the "fix" for what makes us (fill in the blank with your favorite flaw) and with enough study will step up and rescue the deserving of us from the flawed rest of us. Note that nobody ever manages to come up with a reason for them wanting to rescue us. I figure that last is just our own desperation and unwillingness to change speaking.
I suggest a more plausible conspiracy. The actual humans who wish to take control of the entire planet have figured out that fear, especially irrational amorphous fear, can make us do just about anything. We'll attack anybody "other", align with whatever silly improbably hope seems to be offered, believe almost anything without question. All this combined would prompt a vast majority of us to cede our own thought processes to a leader, do whatever is "required", and enable such a professed hero/leader to do whatever the hell they want to whomever the hell they want for as long as they just keep us afraid and make promises for improvement.
If you have trouble accepting that concept, tell me how recent elections around the world are NOT proof it's already being done. No aliens necessary, of course. Sorry if that spoiled it for you.