That's a perfect example of why live feeding gets a bad wrap.
There only thing wrong with feeding live is that the vast majority of the people doing it are idiots and then post videos and pictures of it on the internet. It just gives the anti-live people more ammunition.
There's no denying that feeding f/t or p/k prey is safer...100% safe...though, live feeding, when done properly, I would say is about 99% safe. The benefits of feeding live far outweight the small risk for me and a lot of other keepers out there.
My only response to those who see it as "unethical," then you probably also need to evaluate your own diet and see what kind of treatment is applied to the animals we eat......I promise you that it is much, MUCH worse...