Weasel -
What is the relevance of "right wing" Germany to anyone not writing a book about it? What has it got to do with the right wing in the United States in 2014?
It's about learning. It's about history. I find that interesting myself, and definitely relevent to 21st century life in Europe, as we see many of the same trends and patterns repeat.
If you don't think that's relevent to you, then don't read them.
But then don't be surprised when you don't understand history of the terms involved, as it's clear you don't here. Reading books like the Arendt is how most of us learn history and politics, and the terms used in those fields.