Just think about this on constitutional grounds …
On the one hand, Wisconsin law prohibits the carrying of firearms by “minors” — which are defined to include anyone under the age of 18. And yet another statute treats a 17 year-old as an ADULT for prosecution in the circumstances of this incident.
If I was on this jury I would find the defendant not guilty simply on the basis of this blatant inconsistency of the law — regardless of the facts of the case.
Good point: to hang “minor in possession of a firearm in public” on Kyle, you have to concede he is/was a minor and thus not subject to being prosecuted for homicide as an adult.
...at which point, prosecuting him for illegal possession either gets the statue eviscerated for poor wording, or at most he gets a slap on the wrist with a misdemeanor.