Not seeing it, sorry.

1. It’s pretty normal that main stream reporting looks critically at fringe groups. That can be frustrating, but it’s not an attack. Also consider that any time MSM publish anything that could outrage the political fringes, it is cherry picked and makes its run through the fringe communities.
2. To consider that as liberals attacking the left, I’d have to put on a tin foil hat and buy into the far-right conspiracy theory of “liberal bias in media” or even assume the main stream media and liberals are synonymous.
3. And if I was taking “MSM” literally, the most-watched news medium in the US happens to be Fox News, which essentially put the idea of blaming and vilifying liberals for all the ills in the world on the map.