content: There's no value in deciding for yourself why they did it. That psychology cult bullshit hasn't stopped anyone from doing any horrible things.  Try this instead; They're evil. What they did was evil and anyone that does something so savage is evil. Now you can deal with them and any other savage that thinks about doing something savage will know before hand they're choosing evil. Savages that don't think anyone is evil, don't think anything they do can be evil.