Honestly I don't know anything about this situation. I don't know what was irresponsibly posted. I don't know how folks interacted with each other in the wake of it. I haven't been to Mustach's Playground or seen any of those posts. Therefore I have no opinion on such matters.
What I do want to acknowledge is that I'm certain that Patrick is not the only one who has ever posted something without reading it all the way through first. It's irresponsible, but I, myself, have also done it. Not on Kumoricon forums, but on Facebook. For example, yesterday I was at work when Teddy Kennedy died, may he rest in peace and be well-reborn. My friend mentioned on his FB page something about a famous speech TK had given. I googled it and found an article about the speech. I read the entire article, but posted it without watching the video linked in it first (which was about 1 minute and 18 seconds and of said speech), because I was at work. Now in this particular case, no harm no foul, the video was, in fact, just TK's speech. But who knows, if it had come from an unreliable source, I could've accidentally posted to FB something with inflammatory or otherwise inappropriate content, just because I was hasty and didn't wait til I had a break from or got home from work, so I could do the responsible thing and refrain from posting a link until I'd thoroughly checked out everything that comes with it.