I avoid posting during games due to that reason, what goes through my mind during a bad patch of a game is pure tripe :P ...
There’s one thing that’s much worse than irrational posts during game, though, and that’s defending them afterwards. I only wish more could hold up their hands like you did and acknowledge the influence of the temporality of mental states (also known as ‘the insanity plea’). (Disclaimer: I’m joking)
I have to stop posting during games too. It's simply not very clever. But without pubs open or friends coming over I feel the need to vent my anger.
Just that a board is obviously not the right place for that as football really brings out the worst in me and afterwards you see threads with all your stupidity.