[wesleyd]

If you’re not open to the idea of having your own mind changed, if there is literally nothing - no data, no evidence, no viewpoint, nothing hypothetical even - that might change your mind, you’re not arguing, you’re preaching.

(Is it possible to meaningfully debate with a closed mind?)

[simonh]

Even if you don't persuade each other, clarifying misunderstandings of one's views and identifying any common ground you do have can be worthwhile.