I definitely think it has to do with the morality of people whether they become serial killers or not. But I also do not believe Muslim countries are any more moral than other countries. I guess differences of opinion will come into play here, because morality can be a subjective topic. For example I believe capital punishment, honour killings and the death penalty are immoral acts, however I do not think hugging or kissing a loved one in public, wearing little clothing in the heat, or drinking alcohol is offensive and immoral. I believe all parents in all societies within all countries raise their children not to think it's good to kill other people, so to say it's a Western act of immorality is a bit of a sweeping statement. A serial killer is usually someone devoid of common human feelings, in particular compassion and guilt, and every now and again someone is born with little ability to acquire these feelings. This isn't necessarily a product of the society, but an accident of birth, which means the greater the amount of births, the greater the occurrence.

And the "huge" amount of muslims in Saudi Arabia and Afghanistan which combined are about 70 million people, do not compare to America alone which has over 300 million people. I also do not believe there are no serial killers raised in Muslim societies, but I do think their behaviour is not publicised and immortilised in the media as it is in Western countries.