even our entire global system of Patriarchy

Observation says we have anything but a patriarchy.
Men have to fight to get 80%/20% child custody (where women can assume 50/50 minimum)
An epidemic of men dying to suicide... and it isn't even news. In fact, if you bring it up, you will get banned from the internetz.

Anyway, on to aliens.
Aliens mean the death and destruction of everything.
That is why they were never announced by the govern-cement.

Our entire science... gone.
Our entire history... gone.
Many religions... gone.

It is amazing how much of our science and understanding is based on us being "the cosmic goo" that made it. When in reality, and its very obvious, that we did not evolve completely on this planet.
(See the post on Fermi's pardox just posted today - @kralizec)

We are also still afraid of anything new.

Aliens are being told to us because of the things that the oligarchs are planning.
However, its going to backfire badly because they can't keep control of it when the aliens come and talk directly with us.