Probably because stories that support an outlet's worldview/narrative are investigated far less than ones that challenge it. You can see the same issue with the

Probably because stories that support an outlet's worldview/narrative are investigated far less than ones that challenge it. You can see the same issue with the story of that YouTube prankster supposedly 'thrown off a plane for speaking Arabic'; he wasn't (he was trolling people beforehand), but because it fit the '2016 election led to increased Islamaphobia/hatred of outsiders' worldview, it went unchallenged until others stepped forward afterwards. It's not a pattern exclusive to one political side and their media outlets either; if a story sounds like it can be used to rally the troops and support a message, it won't be investigated too thoroughly regardless of whether it supports the left or right or centre or whoever else.