Well, OK. The point @Luminous Lynx makes that even if this type thing is very good it can help us to identify certain informational patterns that are not going to change (with exception of a traumatic and lucky hit to a head for example) and you are not going to fix it very well. There are things that repel. Now, if we think it as a sliding scale scale rather than dichotomous way it tells that extremes are harder but most of the times it is more doable than total destruction. However, would you like to be happy? Does the other party want happiness...?