The government will never opt for full disclosure because they are in collusion with the Zetan-Greys, stemming back to
President Eisenhower's meeting with them in 1954.
Gazrok is right. Blind faith in aliens is not necessary.
In addition to a number of governments (including our own) having documentation about aliens, there is a plethora of anecdotal evidence available from
credible witnesses, with also some physical evidence like tagging, radiation sickness, etc., among abductees.
If space-aliens didn't exist, then there would be no need for
The Extra-Terrestrial Exposure
Law which makes it illegal to have contact with them.
Finally, if Area 51 were ever open to the public, it would first be emptied of any and all Zetan connections and evidence. So allowing the public to
tour formerly secret government installations is a moot point, as all the corroborating evidence of US-Zetan collusion, as well as the residing alien
scientists themselves, would simply be moved to another highly protected, top secret, underground facility.