Tortious interference, as the name implies, is a matter of civil courts and could open up the person doing it to being sued, depending on the circumstances under which it happens. It doesn't mean they're breaking any laws.
True.
> It doesn't mean they're breaking any laws.
Yes, it does. Civil law is law (and a larger portion of the law than criminal law is), and torts are as much violations of law as crimes.
That's an arbitrary distinction you could equally apply to any civil or criminal violation of the law; its “the circumstancrs surrounding the act not the act itself” that distinguishes murder from perfectly legal self-defense.
Its the circumstances surrounding picking up an item and walking off with it that distinguish lawful activity from theft.