What should we do with unsupervised children?

Give them caffeine

I was unsupervised and I turned out feral. I mean fine.

I like the signs in coffee shops saying, essentially: "unsupervised children will be given an espresso and a puppy"

Well, I favor low and slow.

Bone in, of course. Set the oven to 300, baste often, and cook to an internal temp or 165, as that's the temp that kills cooties.

offer them robux to read marxist graphic novels

Nothing. They don't know any better and probably never will.

The parents however need a hard beating and large enough fine that they need to pay it in installments so they get a monthly reminder for a few years they are dog shit people.

let them catch fire

Context? How about the same exact thing you'd do with an unsupervised adult? Say hello... do some small talk if you and they are both inclined. Otherwise, smile and leave them the fuck alone.