Of course it would be dreadful and absolutely horrible if this child had been badly hurt; but the point everyone is making is that as kids we are sometimes unbelieveably stupid and often, even if well brought up, do not even consider consequences.
As a teen, I NEVER EVER believed anything could happen to ME or could arise from what I did - often the only consequences we can think of at that age is often only "oh boy, are my parents going to be p*ssed off with me" but as we well know, very often that's half the attraction ESPECIALLY if you are taking what you think is a "walk on the wild side" from your boring respectable really good family.
Toucan is very right - its a giggle until its a stuffup. And LS is right in that if the kid was a child who was known to take apart animals and has now upgraded to taking apart humans, then you have a problem. But if its decent kids and just plain stupidity as it often is, then yeah, a psychological assessment and the guilt and the family shame is going to be hard to live with.
Sorry about the lang storie - I am a believer in not lumping all stupidity under the banner of "murderous intent". Each case is an individual one.
At the same time though, I must say that this of course could still have been done to get a person off the bike and rob them and that is of course, malicious, whether done by youths or adults.