“it seems unlikely that misinformation is changing people’s behaviours much. Instead, the situation seems to be that people with specific pre-existing worldviews and intentions seek out congenial information, including misinformation. That is, misinformation appears to be symptomatic of deeper societal problems than an exogenous driver of them.”
https://www.conspicuouscognition.com/p/the-marketplace-of-misleading-ideas