Atheism "rights & wrongs"?

[robvalue]

Or do you think increased homosexuality would cause human beings to evolve into a species that cannot reproduce?

This one wouldn't matter much...since some schmuck accepting homosexuality, morally, won't actually make any extra homosexuals.    We're either doomed or we aren't on that count, as a proposition, and our acceptance doesn't factor into that equation.  

Right. It's been noted that homosexuality occurs at roughly a fixed percentage. So whether you are nice and kind to homosexuals, or go wipe them all out in a rampage, you'll still get roughly the same proportion in the next generation.

If you're worried about homosexuals killing everyone else and then refusing to reproduce, then such a "threat" is present from any subset of people.

All these dodgy arguments "against" homosexuality are just ways of trying to justify being shitty to them.