It also seems amiss in it's tangential change in direction, from the "toxic online world where mass shooters thrive" to - pretty much - focusing on the latest cluster of shooters.
They also continually substitute /pol/ for all of 8chan. It would be akin to saying that The Donald is representative of all of /r/ or that The People of Wal-Mart is representative of America (at-large), when we all know that this isn't the case. Yet, this over-generalisation is continually being made. Why? Is it because 8chan is more readily recognisable and easier to write than /pol/? (I ask because I thought the "fake news" crowd used to have no believable foundation but upon seeing this I can now understand/empathise with how that seed manifests/grows.)