People get very frustrated trying to convince others that they are right. I’ve seen the Facebook threads.
But I believe that much of what people believe in and hold deeply, they have not come to those conclusions–or feelings–by any rational or well-thought-out process. Usually, there is an emotional event that causes us to change how we feel about different things in life. As life goes on, we have more moments that change us.
Thus, trying to use reason and logic and facts and whatever evidence you think you have to convince somebody else that you’re right is usually a fruitless endeavor.
You can’t reason someone out of a position they didn’t reason themself into.