Things that didn't seem likely to have broad support previously, now are seen as acceptable. In the 90's no one could envision rounding up immigrants. No one could envision uploading an ID card to use ICQ. No one could envision the concept of DE-naturalization or getting rid of birthright citizenship.
Today, in the US for instance, there are entire new generations of people alive. And many, many people who were alive in the 90's are gone. Well these new people very much can envision these things. And they seem to have stocked the Supreme Court to make all these kinds of things a reality.
All because the rest of us keep dismissing all of this as just harmless extreme positions that no one in society really supports. We have to start fighting things like this with more than, "It's not real."