This is the US and people have individual rights and should be treated as individuals.
A black skin, being a passive non-behavioral characteristic, does not and cannot predispose its possessor to commit murder.
A homosexual drive, being an behavioral characteristic that seeks actively to express itself, predisposes its possessor to enage in filthy, grossly dysfunctional acts that tend to spread vile STDs.
Your error is that you are comparing dissimilar populations. Being black is a characteristic and homosexuality is a disease.
Blacks have a common characteristic (being black) which does not affect their behavior. A black man raised in a suburban or rural environment acts for the most part like a white guy with a good tan. He is not part of the criminal class and can't be included in it just because he superficially looks like them.
Those who practice homosexual behavior have no common characteristics, only a common behavior. It's been shown that those who practice homosexuality will also practice child abuse. Or according to one study 73% of them will.
Since an unacceptably high percentage of those who have this disease (SAD) also molest, then we can safely say that the behavior is unacceptable.
A better population for your original premise to compare 'homosexuals' to would be murderers. They are both behaviors and both behaviors have 'side effect behaviors'. Murderers are highly likely to break other laws and 'homosexuals' are highly likely to commit other perversions.