What I think the fear is that Man might meet an alien species or an advanced AI system that will put him, or her, in place - A not particularly intelligent
species.
In fact looked at from another than Human perspective, Man may be a rather dumb species, lacking any real signs of intelligence and even Man's technology is quiet limited.
And taking this one step further after watching the blood letting in the Middle East which in fact has been going on for thousands of years.
I was thinking of starting a post titled:
"IS THE HUMAN RACE AND THE SPECIES MAN CLINICALLY INSANE
"
"Insanity Is Doing the Same Thing Over and Over Again and Expecting Different Results"
{often attributed to Albert Einstein}
in any case look at the Middle East, and all of Human History for that matter - And tell me by any measure of any type of advancing
and/or higher order of intelligence that Man has any right to claim intellectual superiority