Best to comment after reading the book. This thread might contain spoilers.
I would like your opinions on what motivated the killer. Is SK trying to find an excuse for his actions due to a troubled childhood and as a teenager ? How is mr merc related to the guy in Rage ?
Are American teens more inclined to violence and do they have easy access to guns and explosives ?
Welcome.
I'm not exactly sure what you are asking but I'll try to give some information.
The etiology of rampage killers is believed to be bio/psycho/social. (Biological/genetic, psychological/how the person interprets their experience, social/upbringing. The people who raised the infant/child as well as the people who did not interact with the child.)
Brady lost his father at a young age, his mother is an ineffective parent, in addition she is an alcoholic and seductive mother who tolerates if not encourages incest. Because of the family circumstances Brady has little interaction with *normal* *average* people. Also, he has a superiority complex even though he work at a low level job with little aspiration to succeed. Most importantly, IMO, was how Brady interpreted these experiences. (Many, many children/teens have horrible childhoods but do not turn to mass/rampage murder.)
So, no. His troubled childhood and teen years are not an
excuse for his actions. It's a explanation, perhaps, on how Brady came to be a rampage killer. (How many mass killers are maybe *made* if you will.)
I have no idea what relation Brady has to the young man in
Rage except for the possible similarities in the above theory of bio/psycho/social etiology to mass shooters.
I cannot answer your last question because I don't believe there is one answer or answers.
Keep posting!
Peace.