Personally or scientifically what do you think is the best way to cure narcissistic personality disorder and victim mentality mindset? Personally, I think the only way to do that is to prevent them from having a victim mentality mindset and have a perpetrator mindset. That way they can focus more on what they did wrong to other people not on what other people did wrong to them and realizing that certain people actually brings them joy rather than pain. It completely depend on how they interpret the meaning of everything and how they choose to react to it. It's possible that they might have a narcissistic parent or even a permissive parent that spoiled their child until they became an adult to the point where their own children lose sense of reality. At this point, parent play a huge part on this and so does the influence caused by their peers. Hanging out with sociopath will automatically transfer their traits into your own subconscious mind. However, regardless of what they went through. After distancing themselves from other problematic people. I do think it is still possible for them to change if they strengthen their empathy and be completely selfless and do all act of kindness without expecting anything in return for a year. They have to make it into a habit not to make everything about them and think of themselves as the main character and not use other people like a side character and an npc that exist for the sole purpose of serving them. The key is to care more about other people than yourself. I do think it's possible for people to change. However, it will not be easy and will be painful but it's worth the effort.