I wish they had the statistics available for people who complete the test. It would be interesting to look at how native speakers and non native speakers differ.
Too often I find that people who are nice in daily life are considered naive or push-overs. It is a skill to be kind to others and to retain the reputation of standing your ground. I'm not sure why there is confusion between having an opinion/looking out for yourself and being a jerk -- and this certainly shines through the most in business where everyone is looking to make money.
My boss is an extremely kind man, but when it comes down to it, he always comes out of meetings and negotiations with what he wanted. Everyone in the company highly respects him for it and everyone is better off because of it.