So, from what I saw, the eagle tried to snag a goat dinner but quickly realized the goat was too heavy - the eagle tried to fly away with it but couldn't - so he dropped it. It's cruel only from the standpoint that the universe is a cruel place.
In the late 1800s, Ernest Thompson Seton wrote a book called "Wild Animals I Have Known", in which he described specific wild animal characters living around his New Mexico ranch. He stated that the life of a wild animal always ends in tragedy - ultimately, they all die by starvation, exposure, disease, overwhelming injuries, or being eaten alive by other animals. None of them die in bed surrounded by their dearest friends. The ones who get a bullet in the brain in the prime of life are arguably the lucky ones (given the above choices, which would you prefer?).
While Seton's approach was pragmatic and realistic, unfortunately his book touched off an entire genre of anthropomorphic nature writing in which animals were given human names, personalities, feelings and emotions, and which has contributed in no small manner to the "animal rights" movement today.
I don't believe animals should be mistreated - and I've never gone hunting in my life (although I see nothing wrong with it), but before you squawk about animal rights, you have to accept the fact that the "people" you're trying to save do things like you see in this video - on a daily basis. The eagle doesn't see the goat as a living being with a personality, emotions, and "rights". To him it's just food.