Argue against the assumption that those who commit heinous acts must have a mental illness.
Why are you so quick to say these kids have mental health issues? Just because something heinous is premeditated doesn't mean they're mentally ill. 
For someone like him ($$$) people will always be quick to justify, or give "excuses for" his actions instead of accept he was just stupid and selfish. 
So malice, absolutely. Mental instability? Not in the slightest. You disrespect those suffering from mental illness when you use it as pity card for these boys. Neither of us know for sure, but if any of them were mentally ill, that would have been a part of his defense....but it wasn't.