Maybe it's because the culprits in this case are six year olds. While bullying can be traumatic, when the bullies are 6, it doesn't go as far as it could if they were 10 or 12. I was bullied all through junior high, and remember it clear as day, so I'm certainely not going to tell you that it's harmless. Surely, it was bad enough to get them expelled. But somehow I can't picture Alexis Gosselin shoving a kid in his locker. And Collin's not exactly Larry Kubiak.
6 year olds (and some younger kids) can actualy be much worse in their version of bullying because they don't have the thinking skills to realize what they are saying/doing and it's potential outcome. some of the issues i had with students/seen at my kid's schools at that age-
(my student-kindergarten) suspended when his bullying included taking a classmate's finger and bending it backward to the point of dislocation-his goal was to break it. repeating horrendous words he had heard at home.
ds's preschool classmate (around age 5)-as learned from an older brother who bullied him, he would whisper threats under his breath to the other kids (i'll get you when you sleep, mom and dad can't protect you, you can't prove it because noone else heard me say this...).
ds's 1st grade classmate (i talked about him above)-body slamming kids during playground play, intentionaly tripping them during running activities with the intent of causing major injury.
dd's 3rd grade classmate-verbal and physical intimidation culminating with sharing with his classmates on the playground (i overheard and reported) "my grandpa has guns, he's taught me how to use them-i could sneak one out and use it here")



none of these "bullies" realized the full and lasting impact of their actions, they only saw the short term reactions in their targets. with older bullies it tends to be the ongoing progress of the torment, and they can be VERY good at knowing where to draw their personal line in order to avoid the actions that can get them in the most trouble (a learned trait from previous school issues, and sadly with some-juvinile court intervention).