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Here is a method to get the other person on your side of the issue: ask them the reasons the counter point could be reasonable.

"Could you think of some reasons why one would vote for Trump? Seriously."

Use responsibly.

The way you phrased it makes the question sound like a trap. It presumes one couldn't think of any reason.

Try "What are some reasons one would vote for Trump?" Neutral tone of voice included.

Agreed. That is what I was aiming for. You worded it better.