Reproduction. What A Disadvantage.

Society deems fit to discriminate against half of the population. By common knowledge, half of the population is obviously feeble, fragile and essentially useless. Unfortunately, this feeble, week half (which is often a majority) is also responsible for incubating foetuses and bringing children up. What gives! Strangely enough, the non-incubatory humans feel that it is only right that since they are crippled enough to not be able to reproduce by themselves, they should view others with this ability as somehow disabled. I suppose humans would quit reproducing next, since it's obviously unnecessary.

Instead of viewing childbearing and child upbringing as a disadvantage of sorts (in economic terms), why not view it as an ability unique to approximately half of humans? After all, poorly brought up children tend to grow up to be unpleasant individuals. The population would dwindle without children surviving beyond childhood. How, then, can half of humanity possibly be the weaker half