That graph looks incredibly un-diverse. Assuming it's accurate, it's mostly childless white male Americans, who skew heavily towards being students.
And?
The entire point is that true statements are true, and false statements are false, regardless of who does or doesn't utter them.
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Well-educated young middle class white men, and with politics that generally flow entirely predictably from those demographics. The only real outlier is the openness to HBD/scientific racism stuff.