Karma: Collective Karma

                                                                  Q. Part 1: Right now I don't know if I believe in God or not. I got this feeling because of recent Tsunami devastations. I didn't quite understand how God/nature can destroy so many innocent lives when they didn't do any bad karma, even if there might be few people who had done bad karma. I also couldn't understand how so many people were destined to die at the same time even though they didn't have anything in common.

                                                                  Q. 1. What do the scriptures including the Bhagavad-Gita and Srimad Bhagavatam have to say about "collective karma"? Our individual karma is generated by our own intentional and unintentional actions but what about the actions we perform as part of a group or as a society? Does responsibility get assigned to each one of us? Particularly, in the context of the planetary environment, we have collectively made impacts on the earth and are now seeing the consequences.

                                                                  Q. Will the karma of parents affect children or not? In other words, will good or bad reactions destined for parents be shared by the children? I had to disagree because of the following reasons:

                                                                  1) It seems unfair that a living entity A has to get the results of another living entity's (say B) karma which is done as a result of B's free will (and modes of material nature & supersoul sanctioning it).

                                                                  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?