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Conservative parents don't necessarily produce conservative children.

But papers do indicate that there is a genetic component to political ideology: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4038932/pdf/nih...

Your argument is akin to a global warming denier saying that yeah, but some days are still cold. Yes, there will always be variation.

That's not really analogous. I'm just pointing out that there is an underlying assumption in your argument that may or may not be true.