re: Actually...
Maybe alien UFOs are disguising themselves as stealth blimps, and deliberately flashing lights so they will be seen and mistaken for self blimps.
Don't laugh, I once analyzed UFO reports for a UFO magazine and when I pointed out the light display on one sighting matched standard aircraft nav lights I was told by my editor that perhaps the UFOs deliberately used these lights to camouflage themselves as conventional airplanes.
And this was a RESPONSIBLE UFO magazine, who had very strict evidence standards and always erred on the side of conservatism and caution.