On the one hand, I believe information and speech should be mostly unfiltered. If people want to spread information that denies the moon landing or climate change, or extols the existence of teapots revolving about the sun, by all means. I'd rather know who they are and allow them to publicly exercise their ignorance. I assume the public would help cause a correction of the zeitgeist.
On the other hand, the fact is that some people become deeply misinformed and do things against their own interests (e.g. voting for a candidate who promises to undo systems that benefit the voter), which can effect all of us. To spare us from going into the rabbit hole of a party politics, I'll just say I read a recent interview with a voter who wants to get rid of x, even though x in particular crucially provides them a life-saving benefit of y, which they want to keep. How does that even make sense? You delve deeper, and realize that some individuals just listen to the mantra of x being advertised as a terrible thing by certain media and public figures, which is easier to understand than to go into the details as to how specifically it's good and how it specifically could be improved upon.
I'd also add technology, like the internet and smartphones, is affecting our behavior far faster than we're aware and in some ways, I think we need to acknowledge our vulnerability. When media companies or groups of websites can cheaply spread misinformation, it is VERY HARD to combat it, because good information takes time to produce and interpret.