It's probably harder to pore through all the four million documents, try to make sense of them and make up your own mind than it is to settle down to Clare Powell's book(to name but one) and have much of the hard work done for you.
At this stage,I'd rather study the dangers of anti-psychotic medications and the urge to kill through the use of them. There are heaps of medications on the market which " treat " depressives,psychotics,bi-polar and post-natal illnesses which have the opposite effect to what they were prescribed for. Multiple shootings and mass murders in America were mostly carried out by those who were taking some form of anti-psychotic or anti-depressive medication.
The guy/pilot who flew his plane into a mountain in the French Alps was taking anti-psychotic medication,making his already depressive condition into a dangerous urge to kill rather than treating his depression. He would have been in denial of his condition before murdering all those innocent people.
Those who withdraw from such medications should be monitored and supported for at least 12 months because their illness can return far worse than before they were prescribed their medication.