It was the first chink in their "total ability to control the online narrative/discussion for nearly all people in the middle" armor.

They will literally never shut the fuck up about him after that. The left cannot survive without the ability to control the news/narrative, and he broke that. Every time the average person gets to see what they've been hiding from them, stuff immediately goes south for them.

The average human doesn't want what the radical left wants. What they want isn't normal. People are indoctrinated into sharing the radical left's worldview.