I'm not being sarcastic here when I say that this development reminds me of a certain story about a survivor from another world crashing here on
Earth after his planet's destruction.
The Kryptonians, didn't want to listen to either.
I know that the story is 100% fictional, but there resounds a grain of truth to the notions contained within.
If in fact the people of Earth were to face extinction(for real) I doubt that the PTB would do anything to warn us.
Better to BITE IT without knowing it's coming.
"Anticipation of death, is worse than death itself"
They already have their contingency plans in place.
Sad to say, that logistically, it would be impossible to save the vast majority of creatures and humans of this planet.
Unless, there is a genetic Noah's Ark fully loaded and ready to go at a moments notice, then kiss this worlds inhabitants good by.
It is inevitable.