What many of these guys and gals are pissed off about is that many companies have gone through the trouble of fixing bugs and not shared the fact that the bug existed in the first place or the actual fix.
I think people in general don't understand what many of these people are pissed off about. If you spent days and weeks of your spare time tracking down a bug and fixing it only to find out shortly there after that company x had a patch 4 months ago you would be a little pissed off.
"Here's something to think about: How come you never see a headline like `Psychic Wins Lottery.'" -- Comedian Jay Leno