Perhaps they feel it would be too embarrassing NOT to reveal the truth, before the truth reveals itself. The fact is, everyone encounters alien lifeforms each day. We've just become accustomed to ignoring the evidence. We expect the first visitors from outer space to arrive in flying saucers. But there are new scientific suggetions that the microbiotic organisms which routinely invade human bodies in the form of viral disease may have extraterrestrial connections.
Life is plentiful in the universe, and eerily tenacious.
Lately, scientists have found extraordinary numbers of unknown organisms which have gained a biological foothold where we once thought survival would be impossible. They grow in deadly ammonia gas. They are resistant to ultraviolet radiation. They thrive inside the radioactive cooling systems of nuclear power plants. And they can even survive the vacuum of space, re-animating themselves when air and water become available.