Another aspect is that a lot of non-left, or right-leaning viewpoints have been categorized into "naughty idea" territory, despite a lot of reasonable people holding them. E.g. Things such as: Being against mass-migration from 3rd world countries to the west, wanting racially homogenous societies, removing welfare, building a wall, racial profiling, there being no gender pay-gap, protesting spreads the virus, BLM are agitators, etc. All non-inherently "evil" ideas, but we've moved into a territory where they're seen as hateful and as such the mainstream is primed to attack them. That is now manifesting (or stared in?) the internet, and we're seeing the consequences everywhere as a result.