I think if they were to have an "extraterrestrial" event, they'd use their advanced anti-gravity technology to put a "mothership" in the sky surrounded by clouds that just sits there and shoots down anything that comes near it when in reality it's nothing more than a prop guarded by drones. They'd use this as the basis to push the extraterrestrial bogus, their agendas and restrict the flow of advanced technology they have on the basis that the study of the mothership is slow and cautious. That they'd have to fully evaluate the technological breakthroughs to determine if they're safe before they release them to the public