Karma: Counteracting Karma

                                                                  Q. My question refers to the digest entitled, "Remembering Sufferings from Past Lives".  In your answers to questions #1 and #2, I couldn't understand what your position was on the connection between remembering our past misdeeds and ceasing similar, future misdeeds.  So, would you please reconcile what appeared to be a contradiction?

                                                                  Q. 1. What is Karma?
                                                                  A. Every action has its equal or greater reaction - this is a simple definition of karma. Whatever activity we do, good or bad, brings us good or bad reactions. Due to good karma, one may get a beautiful body, become wealthy or very intelligent etc., and bad reactions may come in the form of disease, poverty etc., or in terms of heavenly enjoyment or hellish sufferings and so on.

                                                                  Q: My father is now deceased, but was a diagnosed paranoid schizophrenic. He was placed in a mental hospital for years.  My brother is also paranoid schizophrenic and is on strong medication.  I grew up observing the actions of the mentally ill.
                                                                  As such I look very carefully at the reasoning given.  I am a retired police officer and have come in contact with many people who are mentally ill.
                                                                  Now to the question, If a mentally ill person believes his delusion and acts according to it (harming or killing), does the mentally ill person acquire karma?