Consider the most obvious truth. Should one wants to deny it, he/she can surely do, and there is nothing you can do to make him admit it.
What is the most obvious truth?
It is the bright sun, in the mid noon, in a clear sky!
If you are pointing to the sun in clear sky, telling me: look, the sun is in the sky!
I tell you, no, it is not. I do not see it! You must be imagining! You are wrong! You must be sleeping, seeing the sun in you dream!
I mean, when someone does not want to admit truth. When someone wants to deny it. Surely they can. Anyone can do illogical fallacy, and deny even the most obvious truth, when it is against the desire to accept!
So, why do you keep arguing to prove something to anyone, who does not want to accept it. Do you think you can win, and defeat him? What benefit is in these arguments, other than making yourselves tired?
I believe most people try to prove things to others, because they believe the other person does not see.
Most of us believe that we might, by using reason, help the person to see, if not now, perhaps at some later time, when they think about it.
To me, it's more a matter of sharing knowledge that I feel the person may be deprived of.
It's like helping someone with a phobia. Rather than give up on them, we patiently try to help them.
That doesn't tire me.
The man who sees the sun in the sky, may not agree with you because he believes that you are deluded into believing that the alien ship is actually a sun.
At least when I listen to him, I 1) understand what he believes, and why.
When I reason with him, and he with me, 2) I gain more understanding and knowledge about him.
When I do that, 3) I know what approach to take from there.
Since I have already reasoned with him, and allowed him opportunity to reason with me (which I hope he will), and I realize that I cannot pry this thought away from him ... which is real to him. I simply refrain from going down the same path again, because it just becomes a merry-go-round. In other words, I simply let the person know, we've been down that road before. No need to walk it again.
That's not tiring.
The good thing about RF, is that we always have new persons who see things different to us, and the same way I am patient with them, and don't dismiss them as senseless, just because I think I am the one seeing the sun, while they are denying it, I would like them to be patient with me, because they might actually think I am seeing an alien ship.
We can't prove a person is in denial.
Arguments here are not as simple as whether it's the sun in the sky, or an alien ship.