These are not failures. Failure to reproduce does not mean they do not contribute to their society. If that were true, the male/female ratio would have evolved differently.
These are not failures. Failure to reproduce does not mean they do not contribute to their society. If that were true, the male/female ratio would have evolved differently.
This doesn't follow. In animal societies where males are useless apart from their reproductive value, males are still produced at approximately 1:1. This is evolution optimizing for the reproductive success of the individual, not of the population, and is called Fisher's Principle.
https://en.wikipedia.org/wiki/Fisher%27s_principle