[scalable]

"Homosexuality is not a mental illness. We have finally learned this, ..."

This is an opinion, not a fact. We have changed our minds, not learned anything.

[gruseom]

It's true that we've changed our minds, but not that we haven't learned anything. We've learned things about homosexuality in animals. Also, many have learned that some of the people they know and like (and/or are related to) are gay. That's a big change.

[scalable]

Fair point.