Obviously you didn't watch it to the end. She did help Mr. and Mrs. Spooner stay out of bankruptcy and keep their farm. (The Spooners are on record repeatedly, defending her.) Her words about her transformation got a far bigger reaction than the smatter of laughter that scares you so much.
Breitbart didn't bother to watch the entire video. Even though he said today that he first got hold of the edited clips in April, he didn't see fit to research the whole story. Had he done so, he would have seen her talk about her decision to stay in the south and work for change after her father died (she was 17). That she wanted to help only black people initially, but that "God can show you a different path." That she was glad she stayed - glad she didn't make her life about who was black or white, but who needed help.
She did not mention on the tape, but Breitbart could have found out without leaving his desk, that her dad was murdered by a Klansman in 1965. For someone to overcome the sort of hatred an act like that would inspire is transformational. Breitbart screwed this one up.
Mr. Breitbart, you are indeed at fault, for introducing the video in a way that made it seem like she was telling a recent story. For editing it to omit the conclusion of the story, which was: she was glad she didn't make her life about who's black or white (which got more approval from the audience than anything else she said). For further mangling reality by adding wrong info in print on the clips themselves. For not fact checking - or you would have found the Spooners, still living on their farm and calling her a friend. For withholding other facts, example: she wasn't working for the government 24 years ago, she was working for a local nonprofit.
Some people trust what you put in print. You should apologize for getting this one so completely wrong.