They aren't afraid that they will be arrested, and if you leave this hall after the conference, nobody has to be afraid that the secret police is standing out and is arresting you.
체포될것을 두려워하지 않기 때문이죠. 강연이 끝난뒤 돌아가실때 비밀경찰이 자신을 체포하려고 기다린다는 생각을 하는사람은 없을거에요.