The idea is that mainstream psychology gives people excuses or crutches to lean on. You can blame your childhood, your mother, a car accident or whatever. Humanists believe that our experiences shape us, but do not control us. We cannot make excuses for our behavior from our past, because we still make our own choices. We are not just victims of our pasts.
Certainly there are always going to be arguments between competing schools of thought in every discipline. Psychology offers us three principle ways of viewing this topic, as outlined in #3. Humanistic psychology emerges from a very different standpoint, focussing on how our actions and choices are determined by our identity and our life experiences. Other schools of thought downplay our integral identity and argue that it is largely other factors that determine our choices.
Humanistic psychology believes that people think and make choices based on their own experiences and are less controlled by outside stimuli. It also looks at how our environment may influence our decision making process.
Humanistic psychology is considered the third force in psychology, and it represents a reaction against the other two paradigms (psychoanalysis and behaviorism). Humanists consider that psychoanalysis reduces people to irrational human beings, controlled irrevocably by their past and its product - the subconscious. The criticisms against behaviorists are related to the fact that they treat people as passive beings and turns them into giant white mice or slower computers.