Humans evolve no faster than other animals-- we change faster, though. Because while we are at the usual pace (or slowed-down) in terms of evolution, we also have society and technology, and that isn't limited by evolutionary standards.
The answer to why we have those things, and animals don't, is simpler. We hold ourselves to a higher standard... We expect humans to be moral, and notice when they aren't. As has already been said, animals have many of the crimes and atrocities that we do-- its just harder to see a human do it, because they should know better.
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