Genuine question: why as a HN reader - so probably quite scientific - why is it "striking" to you that after learning on this very forum of referendum where you found out that 30% voted to maintain Apartheid, a mere FOUR years later a poll finds 40% holding a similar position?

a) surely you are familiar with error bars?

b) where did you think that 30% went?

I would be astonished if the poll said otherwise.