Supernatural selection

During my holidays I read somewhere that at the end of the ice age humanity was reduced to about 2000 people.
That was close...!!!
Watching humanity nowadays makes me wonder if we are not risking to end like those people during the ice age.
And look to what the descendants of the survivors of the ice age did.
At that time, was a natural selection in which only the stronger survived.
In the future will be a supernatural selection in which only the most altruistic survive.