That's what I do in debates with people that obviously have their minds made up. Regardless of what I say, they will always disagree. And they are entitled to whatever their opinion is, regardless of whether my own is the same. I have limited energy, so I'd rather not expend it (any longer) in battling it out for pages at a time with no end in sight. Better to call it quits. That's just my style. Plenty of other posters do this as well.