Well Larry, whether you think homosexuality is normal or abnormal, there is no doubt that sex between males results in very abnormally high rates of sexual infection and this fact is never addressed by "liberals".
Leaving aside hiv/aids, the latest figures state that 70 % of new infections are amongst male homosexuals.
Other STD's are represented amongst MSM's at similarly high rates.

You say that this should not effect the "rights" of homosexuals, yet close family relatives are banned from marriage or the fostering of children and are criminalised for this behaviour, even if they have offered to be sterilised.
The banning of this behaviour has more to do with undermining the structure of society than public health and many would argue that homosexuality comes into the same category.