I would say, a good conversation. Listen to him, ask question, don’t be too judgemental (and that can be hard). But also accept, that for a big part, you can’t form/force his way of thinking. In the end he has to find his own way in life.

Do you really think they lost over their stance on Israel/Palestina? Not saying it doesn’t matter. But I feel if you see how many votes republicans got, that a lot of (perceived) domestic issues played a very big role.