"For all the good things it has brought our society, the Web has also fostered ideological hermits, who only talk to folks who believe exactly what they do. This creates an echo chamber that only further convinces people that they are right, and everyone else is not only wrong, but an idiot or worse. So when an incident like this one arises, it's not enough to point out an error; they must prove that the error had nefarious origins. In some places on the Web, everything happens on a grassy knoll."