Taken independently that video might make it seem as if Dylan Roof was a confused, angry, sick young man; I agree. But when taken in context with other information like the NYT piece linked below, it might make him seem like an angry, sick, racist young man who was not at all confused and knew exactly what he was doing.
http://www.nytimes.com/2015/06/21/us/dylann-storm-roof-photos-website-charleston-church-shooting.html?_r=0