Considering out planet is about to die, I'd say we've had plenty impact, and have only our progress to blame.
Edit: From what I've been able to put together, evoltion is result of Success and Failure's enternal cycle. The giant Yin-Yang spinning the silk we call existence, constantly changing colors. Infact, I agree we may be the only to understand Good and Evil (oddly, this matches Biblical reasoning, and I didn't even intend that much), and honestly, if that happened - it would make perfect sense as to how we've progressed more than other creatures. The moment we started to comprehend is the moment we start spinning silk faster than all others.