I cannot understand why a family member would be going on television just after his loved one whose butchering was captured on video. The whole thing seems surreal and perverse to me.
I feel the same way, unless there is some very specific goal or cause the bereaved family members want to advance. In this case, the brother had no particular axe to grind and just wanted to remember his brother. That being so, it's hard to understand why he chose to appear.
Further to my earlier reply, though I don't know why he appeared, Mr. Hensley conducted himself with great dignity. Perhaps some people in that position feel they have some kind of public duty to appear, and view shows like Today almost as some kind of semi-official institution that they don't really have a right to refuse.