[Jedi Master Pikachu]

The comment was not stating that incest should be allowed if the population is relatively heterogenous--but was an argument against incest on genetic grounds. There is also a law against incest on Biblical grounds (probably because of genes), as another poster posted.

[LibKill]

Eh, Sorry Master Pikachu, I did not intend any insult.

It is clear that you are also against in-breeding.