Evidently you have joined a number of others who are utterly convinced in our or even their intellectual skills and accomplishments in knowing about all there is to know about such matters.
May you enjoy your smugness while it lasts.
And may you enjoy your tin foil hat, which apparently doesn't protect you from believing there is some vast conspiracy out there to keep people like you from knowing the truth about spacemen. If you want to believe we are being visited by people from outer space, go for it, but please lose the theory that the only reason we don't have the evidence is because the government is keeping it a secret. Apparently you know little about space travel and even less about our goverment's ability to keeps secrets.