"some children complained they were harassed or chased against their will."

I was a kid... Harassment I'll believe, but you CAN'T BE CHASED unless YOU RUN AWAY... :-)

"But Mummy, he hit me back first!"

I have watched kids (I grew up in the days of families with more than ONE child, and had lots of cousins too) - some little slimy arseholes will eagerly START something, then complain when they come off second best... :-) and 'mummy' will 'believe her little darling'.... :-)