Nazi has become so diluted of a word now that they can't relate it to the original historical setting so they think everything around it including the Holocaust is as overblown as today.
They're at the rebellious ages so are rebelling against the authoritarian left and establishment including the ones using the Holocaust as a bludgeon to why we need to do certain thing.
Two likely reasons for the 18-39 results:
Nazi has become so diluted of a word now that they can't relate it to the original historical setting so they think everything around it including the Holocaust is as overblown as today.
They're at the rebellious ages so are rebelling against the authoritarian left and establishment including the ones using the Holocaust as a bludgeon to why we need to do certain thing.