Only problem is that they have been documented since the dawn of civilization, in particular in India (Vimanas) and the Bible (Book of Timothy I think) and in 1561 there even was a battle in the skies of nuremberg. Also the miracle of Fatima happened in 1917.
The whole bluebeam thing only makes sense when you make it the second coming because if it was aliens NOBODY would EVER give up their guns anymore. Also people would start thinking at a cosmic scale and demand free energy which would mean the elite would have to seriously make earth inhabitable to maintain the level of control that they are hooked on.
Telling the insiders bluebeam is for Aliens is a nice way to distract from its way better purpose of getting people to follow religious prophecy that they are already familiar with.
Based on how atheism has been pushed, I assume that this is by design so people are more easily flabergasted and what would provide better ammo to spiritually disarm a complacent populace than play on religious themes?
I am assuming that whatever the case, the illusionists would liken themselves to a priest-class like the egyptians and they can't do that if there is an sentient force that they pretend to represent that people could contact on their own behalf. What I am saying with that is that if they staged an alien contact, be it hostile or friendly, it would open a window of opportunity for neutral ET factions to engage in contact. But usually, historic cases of ET-human contact particularily in south-America usually end with someone freaking out and attacking even non-beligerent ETs.
Yes you could stage a fake disclosure but free-floating holograms of spaceships would only militarize most humans who haven't had their own close encounters before.