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What? He didn't steal anything. It's more like standing outside of the bookstore yelling about the owner.

It's more like breaking into the store at night and changing all the signage to read "I molest little children".

Through a door that was left wide open, and in erasable marker.

Valid analogy - but flimsy security is still not justification for breaking and entering, nor defamation.

And?

The intent is the same whether or not you walk through the open door or break the window.

You're right. Replace "steal" with "deface"