Originally Posted by TheSquealer

who you are is not static and changes from second to second and is influenced by everything around you from every conversation you have to every piece of stimulus from your environment.

If you are asking if people can make major behavioral changes, the answer is obviously yes. I can turn you into a murderer, i can torture you to psychosis, i can convince you to join a cult and slowly turn you into a completely different person with different values. For the most part, a person cannot make major and quick positive changes in who they are without wanting to and without making a focused and persistent effort to do so.