Because in a SoCiEtY, we don't kill weaker males. Instead, the weaker males are allowed to band together with females, and look for reasons for them not getting what they want, which is always "unfairness" or some other bullshit excuse. There's no "fairness" in the wild, "society" created it to placate the weak, when we should've been throwing them off cliffs. Just like people keep searching for the magic solution to getting blacks to act human, it doesn't exist. Weak men, just like blacks, are flawed, but instead of letting nature take it's course(and weeding them out), we try to be civilized.