Fascists don't believe that, and will happily kill people with different ideas if they get the power to do so.
This is the paradox of tolerance. It's pretty well understood, except apparently on online message boards where there are somehow always a bunch of people ready to jump to the intellectual defense of Nazis (evidence: this comments page.)
FYI, whataboutism in a thread about Nazis makes it look a little like you're defending Nazism. Was that your intent? If not, what did you intend to add to the conversation with this (true) observation?
This is the paradox of tolerance. It's pretty well understood, except apparently on online message boards where there are somehow always a bunch of people ready to jump to the intellectual defense of Nazis (evidence: this comments page.)