I won't believe unless they interview a green man. And he must have an interesting accent. American won't do. Maybe a funny German accent or even a Japanese one. That would be credible.
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Yeah, I don't buy this idea at all, either. I have certainly noticed more attention the government is giving to things that normal people consider aliens, but I don't think the motive is to wheel out some creature and tell us it's an alien.
I am not sure what the motive is, but honestly, the government is constantly lying to us about all kinds of things. Global warming. Socialism. LGBT errors. I think there is a general agenda in which the government tries to pump people so full of erroneous ideas that people will not be able to know what to think or believe anymore, and will be more willing to accept government lies. I think the alien agenda helps that as well, so that people become unsure of their own common sense to the point that they just figure maybe the government knows more than they do, so they will just trust the government.
For example, the average person knows by common sense that aliens don't exist. Yet they hear the government telling them implicitly that they do exist. They can't figure out how to reconcile this contradiction, so they figure, "Well, the government knows more about stuff than I do, and they say aliens exist, so maybe I'm wrong and they're right." This undermines their confidence in their own common sense and makes them more willing to believe government lies in other areas.
For me, I think that's what the alien agenda is about, not "disclosure."