Yes, it IS a logial extension.
Because you are “Oppressing” the bigamists, polygamists, Beastility fetishists, etc etc etc by not letting them marry multiple times or marry their pets.
“Oppression” is the same argument used by the gays.
So the example still apllies.
Sorry, it’s not a logical extension. By your reasoning, we couldn’t “oppress” thieves and murderers either.
What distinguishes queers and mormons from, say, pedophiles, islamofascist-goathumpers, mashers, and muggers, is that in the former, consent is freely given between adult parties. In the latter, consent is lacking by at least one party, that is, a party to the act is being victimized, beit the underaged, the goat, the raped,or the person robbed.
Now in the latter, the civil rights of the victims has been abused, and in the case of the goat, well, that’s just animal cruelty. The perpetrators are open
game for “oppression” by state, and rightly so.