Truth often sacrificed for the sake of stability and peace.

There are people who believe in the existence of angels, but do not believe in alien existence. There are people who believe that aliens and angels are the same creatures. But there are people who are much worse, those who have seen and met angels, and witnessed the presence of aliens, but does not admit even the slightest about the linkage between both. And the worst thing is, they even try to maintain the status quo.

You do not say 'It's classified' to a certain thing needs to be hidden, because people are going to find it in anyway possible. Say it in a way with your language that gives people a benefit of the doubt.

The common reason why human mind is so difficult to accept and believe in the alien existence, actually has something to do with the possibility of the existence of some unknown creatures, which may far more advanced than human in terms of knowledge and know-how, yet at the same time people assume that human is in the top level of food chain pyramid on this planet earth.

This world is so full of wars and hostilities.
All parties seek for allies to defeat enemies.
I support peace effort towards mastermind
which has caused men hostile to each other.

If you don't believe what I tell you, then what can I say. I've no rights to coerce others. If you don't believe it from people you trust, then you have to prove it by yourself. If you don't believe your own senses and mind, then you may have to revise the way you believe in something yet alien and unknown.