Quoting OW: As a psychology major, you might agree that people are what they are, they are years of their environment and history. You can't change that, and if that's what affects their behavior, you can't change what you are.
First of I apologize if you feel attacked. But I think you WANTED to be attacked on some level. Having said that, I wanted to address what you wrote above.
If psychologists didn't believe in people's inherent power to change and heal, the field of psychology wouldn't exist. My teacher always says this: "I have to believe that people are capable of healing themselves." You wouldn't go to a therapist if you truly believed that it had no value or that you couldn't modify, change your mindset, behaviors, etc.
DB is a form of cognitive/behavioral therapy. All the jargon, the techinques, etc are to motivate people move in a positive direction in their lives. It is change, it affects some people more than others. What you wish to take from it, depends on you. Just like anything else.
First come the behaviors, then come the REAL changes. That's the premise of behavioral therapy. I work for a company where we teach our patients weight-loss behaviors. Do they REALLY WANT to eat vegetables and low-fat food? NO! But, if they keep doing it for months and months, guess what, they don't reach for the fries anymore. CHANGE has occured. They are different people.
You telling me that people don't change is like telling an excerise coach that people can't lose weight, so they are doomed to die fat and sick. No one is doomed to be a product of their environment and upbringing if they CHOSE not to be.
I'm sorry you feel that people cannot heal. That's a very pessimistic and sad view. Find the hope to heal yourself.
Sorry for some of my anger. But I said that I was a student, and I was not trying to impart psychotherapy to you. I study psychology and therefore can SEE things that are patterns now that I didn't before.
Good luck. May you find your peace. Peace can never come from someone else's suffering. That's all I know.