"A homosexual couple will never bare children, so they will not increase the population, or even replace themselves in it."

>>Why are homosexual couples who do not bear children (you're aware that many do, I hope?) any more of a problem than heterosexual couples who elect not to bear children, or for that matter hetersoexuals who don't elect to remain unmarried?

"This causes a stagnation of the race."

>>What exactly do you mean by 'a stagnation of the race'? Are you referring to simply a decline in world population? A loss of human genetic variability overall? If that's the case, I must ask again how homosexuals failing to bear children is any more of a problem than heterosexuals failing to bear children.

"(You might say that some people have dropped lower than the animals in this regard.)"

>>On what basis? Do you have some strange idea that humans are subject to some biological requirement they reproduce?