Secrets this powerful shouldn't be kept a secret. The problem with this secrecy is the nature of UFO's and the physics involved, and how the technology could lead to a true green revolution. Let's say, on the energy production side of things, that whoever has the tech released open source patents for them, meaning anyone could access them and use them for free. What that would do is give all of humanity energy independence. How many energy-resource wars do we get into, like oil wars? The government can't release this technology, because, largely, people wouldn't need the government to sustain themselves. We wouldn't need a giant military to go invade nations for their resources, like we do now. That means the government would lose most or all control over us. They couldn't use fear to scare us into supporting dangerous and violent objectives, and they're a bunch of criminals, so they can't have that. This technology is and will continue being used against us.
The free flow of information might actually unite humanity under a natural world order, where we stop murdering each other over the dumbest shit. Then, maybe, we could stop warring, and actually have the technology to go out into space without worry and promote the survival of our species.
But, the plan is to use a fake, external alien invasion type threat to ramp up national security even more, give even more control to a militarized state type of mindset. It's all going to be a big Hollywood-style production to just make people afraid, and it's just a giant setup. Just another problem->reaction->solution. UFO's and aliens are very real, but the real alien UFO's that are coming from outer space and crashing here and being shot down by the military are not a threat to humanity. If they were, we'd already be taken over, which we are, and it happened 1000's of years ago, the real alien invasion did.