You need to understand that it is not as easy as it sounds. How can the person know what is bad if that is the only reality they are used to? It takes the other person to make them see that and it has to be gradual. Both parties need to work; the one that needs to gradually work to change the mind set, and the one with the mindset that needs to be open and objective to judge based on what they see, rather than what they have been used to.