Well there is an active genocide where an entire country is being literally bulldozed into rubble with all survivors shot by snipers, heavily documented with endless videos, and the worlds most powerful nation is united in supporting it, so…
Even literally during WW2, the US created concentration camps on its own soil for millions of American-born citizens who happened to be Asian. These people had their homes, businesses, and property just brazenly stolen by their white neighbors while they sat in camps in the desert. They had nothing to go back to. This is why many West Coast small towns have “Japantown” neighborhoods with 0 Japanese folks.
So yes, I’d say it’s safe to say people didn’t “believe” the WW2 camps.