@petra Its fine to read to much into something, but in this case there just isnt anything to back up the claim.
What makes the "BL-victims", well, victims, is the fact that despite being in happy relationships, they are entering them because of an outside force and their behavior is also being affected by said outside force (from what we know), therefor making a distinction between the BL-victims and MC, because the victims feelings, behaviors and will seem to be forced apon by the said outside force.
Plus, we see the MC doesn't blame the characters but the outside force (which only the MC seems to acknowledge so far).
PS: obviously this isnt meant to be taken in a serious tone, its a comedy manga after all .
And well, about the birthrate (even though this really doesn't meter to the comedy aspect of the manga and its once again only something you think if you chose to go past what the manga is), lets just say that since this is a BL world "Omegaverse" maybe is a thing there, or some people just manage to live their life whiteout the force intervening or somehow escape the force by sheer coincidence, who knows.