O.J. Simpson was a bigger deal than JFK's assassination? That alone says this list is crap. Even by the article's criteria, these aren't even really the "Most Powerful" moments. They're just the most talked about and watched.
Granted, some of them do belong on the list, like 9/11, Hurricane Katrina, Challenger, Columbine, etc. Things that matter should have been listed, not OJ, Casey Anthony and Whitney Houston. It's just a completely misnamed list. It's also kind of funny that it's called "TV's Most Powerful Moments" when all the events are from real life.