Research on "the fundamental attribution error" suggests it is "common" for people to assume that dispositions are the underlying causes of most behaviors.
The fundamental attribution error is our tendency to clarify somebody's conduct in light of inward factors, for example, identity or air, and to think little of the impact that outside variables, for example, situational impacts, have on someone else's conduct. We may, for instance, clarify the way that somebody is jobless in view of his character, and point the finger at him for his predicament, when in certainty he was as of late laid off because of a lazy economy. Obviously, there are times when we're right about our suspicions, however the key attribution blunder is our inclination to clarify the conduct of others in light of character or air. This is especially obvious when the conduct is negative.