I haven't read all the comments on these articles, but I haven't seen anyone claim that the bug shouldn't have happened, that anyone should lose their job, that no one "good" makes those sort of mistakes, etc. But this was a bug that lasted long enough and irritated enough customers that one of them finally diagnosed and seemingly fixed it without ever looking at their source code. That's one hell of a process failure. And splitting hairs over whether we would feel professionaly "embarrassed" or "ashamed" in a similar situation is pretty silly.