A quick check of Duck duck go;
reveals several references to a 13 year old in a home, where he had access to 23 apparent (I, naturally, cannot personally, verify that they are actual, functional firearms (no reference was seen about un-seralized "ghost guns" although apparently some of the "firearms" had 3d printed parts.
Apparently the child made online references that were taken as threats (I did not see any of them quoted"), a judge has ordered him held.
I don't see much here that is actually, widely considered, criminal (it depends on local laws, and the "threats" allegedly made). The home had the gun collection inside (apparently "unsecured"). Apparently the 13 year old lived there.
I see a bunch of liberal nervous Nancys here that need to work on reading comprehension and some, that are all set to fly off the handle on other people's gun rights.
I do see probable parental supervision issues with the child's parents.
You folks need to use your heads and intelligence, not your emotions and make fewer assumptions, IMO.
Enjoy!