Yeah, there are definitely a lot of similarities between humans and other animals in that respect, but that's the problem. It should worry us that humans, an animal capable of resolving conflicts in many different ways, chooses violence so often.

To put it another way, if throwing feces was common behavior among humans, you might say "this isn't a human problem, it's a primate problem." And you'd be right, in a sense. But the key point is that throwing feces (as well as violence) is more easily avoided behavior for humans than for chimps. A human might choose to yell to express a level of anger than chimps only express with feces throwing (I might be uninformed about the feces-throwing behaviors of chimps, but you get the point). When we fail to take advantage of opportunities to avoid violence, we should ask ourselves why.