Ms. Lerner is responsible for the agency at the core of one of the worst attacks on American free speech in recent history. I recently watched her "testimony" before a hearing, which consisted of a bombastic speech proclaiming her innocence in these matters, yet proceeding to plead the 5th on any and all questions on the same.
This, to me, seems to be an unwillingness to accept responsibility if not for her actions, then for the actions of those she was responsible for overseeing. The abuses were to news agencies across the political spectrum; The call for her resignation or firing should also be from the same.