Isn't this simply a byproduct of the training data?
For conversations in US English or more generally sourced from USians that end up in training data, there will be supporters and deniers, as with any issue. Conversations about it outside of the US are likely to have far less conspiratorial support.
The model isn't doing any critical thinking here... what mechanism would even support that under the hood? Feels like another thing that is only weird if you assume AI actually works like a human.