They do say that alcohol subdues social conditioning and brings out our real instincts, be it declarations of love, hatred, the desire to have sex, or aggression in young (and old) males.
Countless times I have seen drunk lads become aggressive and pick fights for no other reason than that they are drunk. So does this infer that the natural (i.e. un-socially-conditioned) condition of the human male is territorial aggression?
Silverback gorillas fight off male competition and protect their harem and dominance. Does this explain why drunk guys in the pub beat each other up?