I’m still foggy on one point: were these frum kids? If their parents are frum, that puts the responsibility squarely within the community. The parents can be warned, even threatened with cherem, if they don’t get rid of the radios and control their kids. The issue falls under bais din, and it can do what it considers necessary, unless the parents appeal to civil court, especially since it’s a matter of saving lives.
And for Heaven’s sake, let’s remember it’s the Nine Days.