The left wants a big government nanny state with population control. Both goals would be easier to accomplish, if you could turn all the people into obedient sheep; not human. Doing away with natural gender; male and female, is designed to remove the natural and genetic polarization of male and female, from which passion for procreation arises, thereby neutering a basic individual drive, in exchange for better social conformity; fight procreation in favor of abortion.
Male and female is natural. All the rest of the "genders" is based on free will and choice. These extra genders are no different from wearing a unique tattoo, over your natural body, in an attempt to pretend specialty individuality, that also conforms to the needs of the sheep model.
For example, if you were a naturally born and gifted athlete, but you were told athletics is passe' or taboo, you willl need to repress ti and may try to willfully gain a new self identify, by being a nerd. Since being a nerd is less innate, one will need more doctoring of their persona, so others can see where the actor is heading. If this is ambiguous we will define a new gender. This new you, even if functional, will lack the same natural spontaneity of being a natural athlete, since being athletic was based on an innate unconscious foundation. Instead one will have a conscious persona that the ego creates and cultures reinforces. This is easier to control and is more predictable.
If you surveyed of all the "genders", except the two natural classics; male and female, the vast majority will say they have an affiliation with left wing politics. This is not coincidence. Gender tabooing is part of the left wing programing package. This experiment has backfired on the left, since the gender tattoo is causing an unexpected round of small group individuality; gang colors. Now the goal is to backtrack away from this programming and start again at the ole drawing board.