I would say yes, but I am also a very naturally skeptical person. It is extremely annoying that there is no "smoking gun" despite the vast amounts of circumstantial and anecdotal evidence.
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I doubt it. Governments (especially America) suck when it comes to keeping big secrets like this from the public for long periods of time. Area 51, NSA leaks, Bay of Pigs, Watergates, The CIA's fuck ups, the bunkers within the White House, Nuclear Warheads and etc. History have constantly taught us, the bigger the secret, the harder it is to keep it as such and a secret this big would be impossible to keep behind closed doors unless only a few (2-5) people knew of it.
Hypothetically though, if aliens have indeed made contact with us and our governments knowingly kept it a secret from us then I would support that decision 100%. Humans are not ready to know of the existence of extraterrestrial.0