If anyone doubts that homosexuality is a mental illness, here are some key reports and studies which affirm that homosexual conduct is inherently harmful, and that such behaviors are borne out of emotional and mental harm, trauma, and damage.
Until 1973, homosexuality was properly recognize as a mental illness, a psychological disorder,
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4771012/
https://www.hrc.org/news/flashbackfriday-today-in-1973-the-apa-removed-homosexuality-from-list-of-me
https://jamanetwork.com/journals/jamapsychiatry/article-abstract/205342
https://bmcpsychiatry.biomedcentral.com/articles/10.1186/s12888-016-0767-z
https://www.psychologytoday.com/us/blog/hide-and-seek/201509/when-homosexuality-stopped-being-mental-disorder