In art juxtaposition is placing two opposite things next to each other and leaving it up to the observer to establish connections and derive a meaning.
At a recent forum I attended on school safety a parent asked a question during the Q&A about having a person designated at the front office that was firearm trained. The police chief responded to the question with a question, "Do we really want our kids to go to school with an armed guard at the entrance?" We are not sending our kids off to jail. As a community, I do not think that is what we are prepared to do, at least not yet.
There needs to be balance between two opposites. Protecting our kids and still letting our kids be kids. That is the juxtaposition.
What connection do you get with the two photos?