Because its a desirable trait early in life, with a baby, that helps increase the odds of survival because of how useful it is for the babies. All removing it would do is make male infants die more often, which only makes all the problems worse.

And all the social pressures in the world can't beat that biological fact, and the tear ducts don't just dry out with age because they continue to see use in things like heat and illness reactions.

Evolution isn't a single factor process.