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it's hard to think that a rising tide of neo-Nazis would escape the notice of a group of reasonably educated, establishment liberalsIt's more likely that a bubble of "reasonably educated, establishment liberals" would not understand the grievances of another group of people, and perceive them through the lens of "a rising tide of neo-Nazis", othering them and directly creating conflict, rather than understanding them.
This is how the filter bubble actually works. It's not that the information doesn't come through; it's that it comes through a glass darkly, at high risk of alienation from people holding out-group views.
If, for example, you think that people who don't like change in the social composition of their community are morally wrong for feeling uncomfortable, you're going to push for cultural movements that demonize them. And that makes the problem worse; it amplifies conflict and widens the cracks in society.
There are multiple self-coherent but mutually incoherent views on how society should be structured. As I get older, I find myself feeling less strongly about one view versus another. I am most suspicious of those who believe they have found the one true view; their zeal for change isn't tempered by doubt. No matter which coherent perspective you have, you won't succeed in moving people with other perspectives if you don't acknowledge that their perspectives are also coherent. Your best bet for achieving change is reframing that change within the perspective of those you're trying to convince. Saying that the people you're trying to convince are evil because their view is wrong won't end well.