Yeah, they are so vague with details we know it's because they fucked up. If they had some sort of "justification" they would have all the details available to us.
Cops are not judges, they aren't even required to have an accurate knowledge of the law. Disarm and defund police, put the money into education, healthcare and public transit.
I'm a grown adult man and I think I could take pretty much any 15 yo. For the unusual case where a 15 yo is bigger than me, I believe that with the help of another adult we could still take them down. Why would guns be needed? Why wouldn't a taser be used? Wtf.