To understand why people behave as they do, we need to examine the causes and drivers of that behavior: their motivations. Everyone (including you) is driven to act for some reason or other. You may not always see or understand that reason, but there is one. Only insanity has a person acting for no reason at all! So, to get a grip on any behavior, to understand it, predict it, or even influence it somehow, you need to understand what is fueling it, i.e., you need to understand what motivates a person.