Other animals that suckle their young teach those young to go out and hunt/forage for their food, neither of which are viable ways for the majority of humans in the developed world to obtain food, and I am grateful that our superior intellect, which you seem to have issues with, has enabled the development of civilization.
Secondly, that statement is not true for pan troglodytes (chimpanzees), who start weaning their infant whenever they want to with no regard for milk production, and I would bet that it is not true for other great ape species.