I read the story again on another site, apparently this was his DAD'S M5, not his... so I guess the "stupid" factor is decreased somewhat in their favor - I didn't see if this kid's dad actually let him use it (stupid) or if the kid took it without his knowledge (stupid for not keeping the keys locked up).

Doesn't really matter in the end, though - no matter what, it doesn't make their son and those other kids any less dead.