plus ca change ... humans have lived forever with highly suspect information (myths, legends, movements, religions, taboos) guiding their lives and creating death, division and destruction.
Only the rich and educated have the knowledge and resources to access higher quality information.
The internet is already awash with toxic lies even without AI.
Look at Trump followers. Half the electorate believing absurdities.
Look at this comment. It's based on nothing at all. Just a rando spitting bile with a baby crying on my lap. But it's probably going to be on the internet for 100 years.