Without children the human species will simply die. If that's your goal or an accepted side-effect of your goal, then Antinatalism makes sense.

If you don't want humanity to die, then it is far too simplistic and it would actually be wrong to not value people having children -- at least to some degree -- since as far as we know it is the only way for humanity to continue.

In reality, as with most things, there is a lot of grey area and difference of circumstance that factor into the morality of such a decision.