The existence of something in our natural world, does not alone qualify anything as natural. That applies especially to mental disorders.
This is a good book on it, I’ve turned to Chapter 2,page 45 on natural kinds...some can be said to be of natural kind, some not: https://books.google.com/books?id=FNFQTA3AjK8C&pg=PA45&dq=Is+Disease+a+Natural+Kind%3F&source=gbs_toc_r&cad=3#v=onepage&q&f=false
You’re right, nobody wants to celebrate the Cancers, etc, but they do want to celebrate homosexuality, etc, which are essentially avenues to spread deadly diseases.
64% of HIV/AIDS in the USA is among <3% of population, men who have sex with men...a completely unnatral relationship. These numbers are rising among this group.
70% of all STDs in the USA are among homosexuals in general, though that’s mostly among men who have sex with men. These numbers are rising among this group.
The CDC did a study of Male-to-Female Transgender (Transgender women, they like to call them) sex worker in 1987 - 68% were HIV/AIDS positive and 50% didn’t know.
More recently it has been proven that Male-to-Female Transgender as a group are 50 times more likely to be HIV/AIDS positive:
http://www.thelancet.com/journals/laninf/article/PIIS1473-3099%2812%2970326-2/fulltext?_eventId=login
Either something is natural—that is, it exists within the laws of the natural world—or it is supernatural.
I do not know of anything that is supernatural.
Natural things can absolutely be pathological, and even lethal. Earthquakes are natural. So is mental illness, which is highly pathological.
Assigning the word “natural” to a pathology to make it not only acceptable, but something to celebrate, is the issue here. For some reason, leftists love mental illness, especially when the illness centers on sexuality.