Why the "Legal System" isn't a "Justice System"

Some time ago, a guy decided to make some art out of some construction barrels, you know, the big orange and reflective monster things in the road?
He made a monster out of a few, and the company loved it, and even hired him to create more art for them...but the police filed charges against him, even though the "victim" wasn't a "victim"...
Barrel art nets arrest, notoriety for NC student

Now, in Provo, Utah, we have a similar situation. Some kids decided to emulate a McDonald's ad by rapping their order in the DriveThrough. When asked to order normally, they repeated the stunt, only slower...
They were then asked to order normally or leave, and they left...to later be arrested and charged with "Disturbing the Peace"...
Now, hold on, they complied with the Business's request to leave...
Teens cited for burger ‘rap' in drive-thru

Its getting to where you aren't safe being a kid. How sad live will be when the simple act of living will get you arrested for something, charged with a non-crime (no victim) and have your record tarnished.

And where do you draw the line between "expressionism" and "bullying"?
Teachers strike back at students' online pranks