[Sin]

I'm a tossup between 1 & 2.

Usually it depends on my opponent. If I'm feeling particularly obnoxious & stubborn I might hang onto an issue & drill it so hard that the other person begins to question their own point, (I'll do this if they show any kind of hesitation/uncertainty about their own side of the story regardless of if they're right...)

If someone can put up a good enough argument though to get me to look at their side, I'll look.