The APA is a liberal-driven left wing political action organization driven to push and comply with radical left-wing and social justice issues. Twenty some years ago, they defined homosexuality as a mental illness. Then a small group got together and decided it wasn't. Next year, maybe they'll change their minds again. They drift like the wind because mostly what they have is theory, opinion and beliefs, generally based on reported or observed behaviors.

You stick with the animals and when someone kills and eats their own child, you can go on national news saying, "Animals do it, so it should be OK for humans"

If you are going to use animals to "justify" or explain human behavior, then picking and choosing behaviors is disingenuous, suggesting a political socio/cultural agenda.

And no matter what, homosexuality is just wrong. Keep it to yourself and there's no problem. Start making it a public issue and the public should push back.