Why did Loughner do it?

My first step in approaching this assignment is thinking about what it would be like to be in a persons' place who was thinking about killing someone. Would I be able to? What would it take for me to even consider such an atrocious act? In all the sources thus far, it seems as though the killers were suffering from some sort of emotional or mental disturbance that enabled them to rationalize and justify taking another persons' life. In the Milbank article, there is a discussion between Glenn Beck and Bill O'Reilly on what are necessary attributes of killers. Bill O'Reilly asserts that people only become killers when they are mentally unstable. While I am inclined to agree, Beck's rebuttal that people can snap mustn't be overlooked. While each case has its own, individual reasons why the killer snapped, I had another thought in mind while examining Loughner's specific case. The portion of the article about Loughner that discusses his drug usage (specifically LSD, psychedelic mushrooms, etc.) was of importance in this situation, I believe. I researched his background a bit, and found an article in the Pioneer Press that interviewed neighbors who had been near the Loughner's for years. One of them told the reporter that he saw Amy (Jared's mother) consistently buying cases of beer at the grocery store and were very private people. It also said that his father had not had an out of home job in some time. The beer alone would lead me to believe that someone in the household had a drinking problem, which can psychologically affect children on its own, without even adding in Jared's own alleged drug use. In the Journal of Health and Social Behavior, a study was done on LSD users. Interestingly enough, Jewish people between the ages of 18 and 22 had the highest proportions of LSD users. Also noted in the study was an interview were the parents of a friend of Loughners' who mentioned that he would go to their house several times a week and practice Tai Chi with their son. In the study in the Journal of Health and Social Behavior, it was also noted that a noticeable amount of LSD users practiced religion as Buddhists, which is a religion associated with Tai Chi. Later in the study, the author tells that LSD users are also generally switching between jobs and not students. I realize this is a lot of rambling about correlations between LSD and some features of Loughner, but I found it rather interesting how many connections there were between his personal life and the drug usage. The point of all of this information was to lead to this; the study later informs the reader that the psychological effects of LSD users include schizophrenia and psychopathic deviation, and that in most cases, a theme of disequilibrium in parent-child relationships (mostly stemming from parent pressure such as censuring, quarreling with, and punishing the child). Because of this evidence, I believe very strongly that he was unstable to begin with due to home life, and his drug usage pushed him into a state of psychosis in which he was unaware of what reality really is. It's hard to say, in the end, if he really was aware of what he was doing. On his YouTube channel, he posts; "If you're editing of every belief and religion reaches the final century then the writer for every belief and religion is you. You're editing of every belief and religion reaches the final century. Thus, the writer for every belief and religion is you. You control every -- thought, action, and lifestyle -- for the person or people as the mind controller. I'm able to control every belief and religion by being the mind controller." I suppose anything could be possible.