Better stated, the majority of the psychiatrists who originally put homosexuality in the DSM had a religious, and a political agenda.
If that is true, then homosexuality should not have been put in the DSM in the first place because of religious, and political agenda.
What is normal is not the issue. It is not normal to have a high IQ, but many people who have low, or average IQs would like to have a high IQ. The DSM is a manual of mental disorders. It is not necessary to know what causes homosexuality, or anything else in order to study whether or not practicing something has harmful consequences. Homosexuals who are monogamous, and healthy do not harm anyone.