I have mixed feelings on this. Part of me thinks that a teenager, as you said, would know what they’re doing and should face the consequences.
On the other hand, I’m sure a lot of us would like to think that mistakes we made in our teens don’t reflect us once we’re adults. Putting a kids name out there now will be a millstone around their neck for the rest of their life, unless it’s a particularly serious crime I’m not sure how right would be.
My final thought, why do any of us need to know the name of a 13 year old in Aldershot who was threatening violence? What difference to our lives does it make? It’s reassuring to know that people are being prosecuted and held responsible, but that doesn’t always mean we need to know each individuals name.
As you say, allowing a 13 year old to join in with this sounds like a huge failure of parenting as much as anything. It doesn’t excuse the 13 year old, but it’s certainly mitigation.