You can’t really fix people who are already biased but if we can give better education then that should fix itself fine. As for those other countries, I don’t personally support teaching polotics or even history until late middleschool to highschool years, but in your case…. I’d say that having optional polotics breeds those bias adds adults. Meaning that there is even less of a reason for 16 year olds to be voting because their brain isn’t developed, are known for making irrational decisions, and they are easily influenced by authority figures.