Well, the video has been removed, so I haven't seen it. I'm not a fan of wanton harming of animals, although I don't get as wrapped up in protection as some people I do like animals, and feel we have a responsibility to treat them decently.
I will say, however, I can logically understand how these Marines were able to do something like this.
1. Human life is on a higher plane than animal life for the vast majority of people.
2. They are immersed in a situation where human life is virtually worthless within the mortality timeline, which in many ways includes their own.
3. Therefore, it is logical that, in their situation, animal life holds far less value than in any normal situation. Heck, for all we know they just scraped their buddy's shredded body from a smoking HMMWV a few hours before this video was shot. "Life" takes on a new definition at that point.
Just food for thought. I'm not justifying it, but putting something out there to think about before someone goes off saying what horrible guys these Marines are.