I think it's worthwhile to show people that views outside of their like-minded bubble exist. One of the nice things about the Fediverse over Reddit is that the upvote and downvote tallies are both shown, so we can see that opinions are not a monolith.

Also, engaging in Internet debate is never to convince the person you're actually talking to. That almost never happens. The point of debate is to present convincing arguments for the less-committed casual readers who are lurking rather than participating directly.