Err. I think most responsible parents/caregivers' reactions to a 10 year old murdering a cat and carrying its head around would be. Well. Bigger than this. Letting this kid run around free implies complete nepotism and irresponsibility on the part of the Batclan. And that's ignoring the fact that he's already been shot while playing Robin.
Dangerous to himself, dangerous to others, desperately in need of therapy and deprogramming. Where's Child Services when you need 'em?