The mainstream news passes off bullshit all of the time. Its not sloppiness. Its intentional. Some of the very examples from that article (I've got some opinions about medium.com but that is a different issue) were the epitome of mainstream media initial hysteria, blame casting, and the following excuse making. The Boston Marathon bombers and the Pulse shootings come specifically to mind.
The Sandy Hook false flag stuff is infuriating. I completely agree with you on that point.