True but the problem with misinformation and fake news is that many people, especially the stupid ones, have a really hard time changing their minds after being presented with truth. Someone with a huge platform like Joe has to be extremely careful about fact checking statements like "antifa starting fires" because once the misinformation is published, the damage is done and no amount of admitting he was wrong will change every single persons mind that believed the lie. There's always gonna be dumbasses that won't listen or won't care because it already fed into their attentional/confirmational biases.
There was a study published recently in Scientific American about this and I'm sure its something MSM knows about and exploits regularly
https://www.scientificamerican.com/article/cognitive-ability-and-vulnerability-to-fake-news/