If the theories are anything to go by, and we had no 'social order' (look at all the crap going on in the world at the moment) then the strong would be:
Those willing to kill Meat eaters Heterosexual men and women Those with no compunction when it comes to killing their own species for survival
So, the pacifists will die out.
The vegetarians will die out.
The gay people will never procreate and therefore not add to the population boom. They'll die off and no one will miss them.
The 'physically strong' will survive.
That's the way nature has been all the time, it's just that human beings have screwed it up and gone against nature by becoming tofu-eating-gay-pacifists.
The trouble is, when there's a war, the meat eating, heterosexual, stronger-than-the-rest males (mainly) are those who go off to fight. They're the people who end up getting killed, thus reducing the likelihood of procreation of the race, weakening the gene pool.
They're not the people that need to be eradicated though. We need to get rid of the draft-dodging, namby-pamby politicians who send others to war and sit safely in the WhiteHouse.
The only way that the human race will continue is by adopting a strict population control.
I hereby propose that we adopt the principles of the society as proposed in 'Logan's Run'. Kill all those over 30. Except me.*
* anyone not realising that this is a comedy post aimed at taking the piss out of the ignorant is, as our American chums say, 'Dumb as Fuck'.