Exercising Moral Foundations Theory

The moral foundations theory was proposed by a social psychologist named Jonathan Haidt where he suggests that our moral 'taste buds' exist in six major areas: care, fairness, loyalty, authority, sanctity, and liberty.

From what we've learned from a study done in 2017, liberty and fairness are important to anyone regardless of their political stance, so you can try to reframe your argument according to your opponent's beliefs.