I have been thinking of adopting a policy in which I don't insult people on my weblog in any manner in which I wouldn't be comfortable saying to their face.
For example I won't be accusing nearly so many people of being idiots, twats or liars just because I strongly object to their stated viewpoint on matters, because in real life these traits seem to exist across the political spectrum so if I'm repeatedly seeing them only in political opponents online then I am probably misjudging the matter.
Obviously if they demonstrate beyond doubt that they are any of those things then I'll still say so.
Commentators are free to continue insulting whomever they wish.
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