Ifind some days i look at yesterdays posting and realise i was in a completly different frame of mind and wish i hadnt bothered!
I sometimes get similar, but more that I look back and think that I could have made my point better.
If I disagree with something strongly I sometimes just go on bit typeathon without really thinking it through. I normally get at what I'm trying to say but it's often in a round about way.
This happens quite a lot when I don't completely disagree with someone's overall view, just with their reasons for having it. Nothing winds me up more than when peoples opinions come across as being based on newspaper style editorials or radio phone ins; anything where the facts are hand-picked for an emotive response and don't really represent the reality of the whole situation.
I think that if you're going to have a strong opinion for/against something then you should really have a good understanding of not only the entire subject, but the reasons that someone might hold the opposite view.