Very Impressive
I was very happy to see something like this. Newgrounds needs more movies like this. Unfortunately, society is filled with idiots that fill their heads with Hollywood garbage and don't want to have to analyze what they're watching. For those of us who want more than that and actually put our brains to use, you gave us exactly that. Needless to say it was in a very deep and powerful emotional way.
Anyway. I plan on giving this a second viewing, but first time around, here's what I thought the theme or moral could have been. I'm sure I may be off, but what I gathered from it is this seemed to be about moral sacrifice through betrayal. It reminded me a bit of the whole McCarthyism concept consisting of people being forced into giving up other innocent people who were once close to them in order to save themselves. As for the man himself, the fact that we never actually see his physical features, only a black silhouette, may suggest that he is completely empty, physically and emotionally. And even after he is released, he is still a black silhouette, meaning he got nothing back after being getting out. Upon realizing this and the betrayal he has brought upon others (possibly the corpse his tear falls into), he decides that he is not a clean soul even though he was told he was doing the right thing. Perhaps thats what the red "up" sign was suggesting. But the fact that he descends to his death in the end may mean that he was given no such glorious fate. Only a dark and shameful one, which is what he felt he deserved.
I'm not sure if the bridge itself meant anything, but if it did, I would think that was a metaphor for his own personal purgatory. Seeing that he had already gone through a form of purgatory through the camp, he refuses to let himself be judged again and would rather be his own judge by sealing his fate and punishing himself.
As for WHEN this takes place, could be anytime, but the signs say 1951-2007 and things like that so my guess for that is maybe this is a post World War III type situation.
As for the title, my guess is it suggests that human beings are no better than the creatures we label to be "Animals". As most animals do, we will do anything to survive, even if it means killing off our own kind to do so. We're no different than animals on a food chain in predator prey relationships and we are hypocrites for thinking we're above all that. If anything, we are worse.
But like I said, I could be totally off here because thats just my first guess after first viewing. Maybe you could respond or message me letting me know if thats right or totally wrong.
Anyway, VERY impressive work, artistically and emotionally. Newgrounds needs more submissions like that. Well done.