Your average Parisian kiddy's square attracts a curious array of individuals. If it isn't the can in a bag brigade it's your young toting turks and even the odd bone fide innocent minor.
There's rarely a problem, as all these strata of society seem to coexist just fine. And I've never seen a fine. A gentle warning nudge towards the exit if things get too blatant is generally all it takes. After all, people sitting in parks aren't the city's biggest crime threat by a long shot.
It's sometimes not too clear who's watching whom, but that's another story.
And why not...