The problem with that approach depends on the issue we’re talking about. To continue picking on the Nazis: allowing them to “just ask questions” for example is a great way to allow them to spread their ideology in a way that thoughtful moderation could prevent.
That’s nonsense - bad ideologies take hold in “normal” people all the time! I’m sure we all have that one uncle who was taken in by all the Q-anon talk, or that one friend who ended up joining a cult.