Let’s play a game, then. If all the gays were straight…
Since when? Let’s say since the birth of Jesus, seeing as how most homophobes reckon they have such a high opinion of Jesus.
Assuming a generation is 25 years and 1% of the population does not reproduce on account of being homosexual, if all of them in the last 2,000 years had been straight instead there would be twice as many people. Yes, I have worked this out!
The world cannot support its current human population, never mind 15 billion. But the population would never have gotten that high anyway, as the environment would have collapsed several centuries ago and the human race would have been reduced to a few million raggedy living skeletons picking their way across the desert of the world. That’s reality, not feelings.
But assholes like the quotee tend to reject ecology as a sub-set of reality. And normal human feelings.