Instead of simply assuming that you are right,
(…or telling people things to that effect)
Consider sharing with them how you got to your position
And then let them reach their own conclusions.
Yes, it’s likely that you’ve not examined the issue in its entirety
And, thus, are presenting an incomplete and biased set of considerations
At least you’re doing them the courtesy of sharing your reasoning
Instead of just telling them what you think is right.
Instead of adversarial, try conversational.