Ch'i

Quite possibly, yes. Though I would argue that "misguided" would be a more accurate term.
Yes and no. Though greed plays a major role in lawsuits, and the general though proccess of your typical person, it also appeals to the id (the source of our drives). The typical person believes they deserve something, in one way or another. Since they usually do not get entirely what they desire, they reach out at any opportunity to close that gap between wishful-thinking and reality.
This, I think, comes from that very same desire described above. They feel they deserve to be listened to more than others. If this fails to happen they will seek vengeance in some way. Sometimes this manifests as tailgating on the highway, or walking around with a massive chip on their shoulder at the office. If one expects two, there will be disappointment when there is only one; if one expects nothing, everything and anything will be appreciated. Which leads back to the appropriate term for these people; misguided.