This isn't my first rodeo when it comes to Israel-Gaza. I don't think it's as small a minority as you think it is. I think they or people reading may often not be aware they're parroting anti-semitic tropes, often because they're disguised in dog whistles. For example going on about how '''they''' control all media. Not influence or media bias, but full control of all media. Or going on about how 'cunning' Zionists are. In any case, they're very loud and far too often tolerated.
The problem is that when people tolerate them or don't tell them to fuck off, it allows supporters of Netenyahu's government and the actual racial supremacists in his cabinet, to paint all criticism of Israel as anti-semitic.
It's like inviting Gary Glitter to become the patron of a children's charity. No matter how good the cause, people will never be able to fully trust you.
This is a problem I keep running into when advocating for Palestine: I try to amplify relevant voices only to find them using their platform to spread delusional conspiracy theories against the Jewish people (or, increasingly, against Ukraine). It doesn't change the horrors being committed against Palestine, but it does make it hard to find someone I'd want to be in power to make changes.
Don't worry, the opposite side has similar issues where calling for accuracy in reporting, open discussion and analysis of what (both sides) are doing and have done is just met with zoinist or Semitic (been called both) or justification for war crime, or other completely uneducated input and bias.
Keep advocating for what you believe in, use facts and quality sources, hold everyone to quality, accuracy and accountability.
Yes, it's a town. Auschwitz is German for Oświęcim, which is a town where the barracks were repurposed for the death camp. They then built a second one, Auschwitz - Birkenau, 3km from Brzezinka (Birkenau). That one was purpose built instead of repurposed.
Nearly if not every concentration camp and death camp was named after a town or city it was built in. These weren’t hidden off in forests somewhere, they were built in locations with people able to staff and support them. This is part of how we know there’s no way any reasonably informed citizens didn’t know the holocaust was happening.