I watched it, and I regret that the murder happened, but no, I don't regret watching it. That is just how my mind works. For me, discussing the case without seeing the video would be like discussing a book I had never read. My career in Pathology also tends to make me very clinical and I analyze the world from data. I understand and support other people for NOT watching it. I can't watch the kitten videos. I am not sure what that means, but it is the same reason I can work in a hospital but not in a Veterinary clinic.
I feel exactly the same way - can't watch the kitten videos! But years of working in hospitals and dissecting human body parts as a pre-med has enabled me to detach and view everything from a very clinical perspective. However, I would have had to FF through the murder had that been filmed.