Why would a UFO NOT make contact with the general public? Simple. We are cannabals. Of all the creatures on earth only Humans (Homo Sapian) enjoys killing not only fellow humans but also the very planet humans NEED to survive. Imagine, if you will, an alien population capable of flying within OUR atmosphere. First they have to GET here, via space travel. They would NOT be intellegent enough to make the trip if they did NOT intercept our transmissions along the way. That means they most likely hear and see out TV News, Radio Stations, and Military transmissions.
They know what we expect Alien Invaders to do to us. E.T. is the exception and Star Trek excedes general atmosphere for Earth-bound humans. Our media clearly shows that our Governments and Populations can NOT be trusted. Our own HISTORY for just the last 100 years tells Aliens that we will destroy human populations to get what individuals desire.
Hitler enslaved and entire continent, slaughtering his own people with NO apparent reason, apparent to Alien anyway. America, corraled oue own people into internment camps simply because of their ancestary. Our elected officials send our people across the world to war with another country and transmissions claim its for their freedom. We kill people for their freedom? Isn't that carring belief in an afterlife to the extreme? Can you imagine what an Alien Culture thinks about the history of Atom Bomb tests, inprovements, and proliferation?
Going back just a little farther we see how Europeans slaughtered the original "OWNERS" of this continent, America surplanted a planet loving people with total planet destruction, first in ignorance, NOW, in greed!
When Americans first learned about Sadam's horrors, we were in favor of the War. The appauling inhumanity was enough to mak US want nothing to do with that regiem, yet are we any different in America? Do we not fight hard to deny specific "unacceptable" groups their right to live, while fighting harder to get the founding Murder of a mass murdering Gang set free, back into society. We have crys, in public, to stop drug horrors while being the WORLD'S biggest client for smuggled drugs. With almost daily news showing the horrors of illicit drug trade, we still increase our drug consuption. Knowing that our drug habits get hundreds murdered on a regular basis and growing indications that slave labor is use to grow, harvest and distribute our illegal usage,we do nothing.