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This guy is feeding a live mouse to his fish, but the way this dude's reveling in the animals suffering, selective editing, etc it appears to me that it was done just to attract people who enjoy watching this kind of thing. There are a lot of people who are morbidly curious, so I guess there's that too. But to enjoy the pain of another living creature? Yeah, that crosses the line for me.
On the other hand, people will say that there's nothing wrong with this kind of thing because he's just feeding his fish, that it's natural. Context is, as always, important.
What do you people think?