It’s been raised whether the family of that feral child should bear some responsibility and perhaps be charged with a connected offence.
I assume such a charge would involve a tribunal or Court to ascertain the degree of culpability of the parent(s), adding another layer of bureaucracy, admin, red-tape, box-ticking, form-filling, assessment, etc, etc.
Disengaged parents leading chaotic lives being forced into accounting for themselves would IMO open up a Pandora's Box and I'm not sure how much impact such a threat of punishment would have in creating a more tempered and stable home environment. If parents are actually committing crimes themselves, there's already a legal procedure for that.
Youth crime, gang-related crimes, anti-social behaviour is, I think, complex. As others have pointed out, children from good, stable backgrounds, go rogue, while some from a totally disordered environment, somehow manage to keep out of trouble.
Children of dysfunctional, often impoverished, parents lead very narrow lives, their world is often insufficient and attenuated. Perhaps there is very little for them to look-forward to other than getting thro' school and earning money. If their options are limited, it must be quite tempting for an undeveloped mind - with little to no parental guidance - to resist the 'glamour' of belonging to a gang. And then, there's peer-pressure, too.
Tempting as it might seem, and as obvious as it is that parents have a responsibility for their offspring, I don't believe that punishing them for their children's behaviour is going to get anywhere near helping to solve the problem.