No person is allowed to deliberately render common resources useless or unavailable. It is not possible or desirable to have detailed rules about everything that people should do or everything that they shouldn't do. Life is most enjoyable as a spontaneous journey of discovery, pursuing one's own uniqueness, exploring different angles of life. We can not judge the relative rightness or wrongness of actions simply based on what specific actions are done or based on the specific outcome. The whole situation as it is needs to be assessed, and the intentions of the parties involved need to be elicited.
Integrity is about the most important element in a set of universal social rules.
However, integrity is a concept that has been conspicuously absent from the practice of law in recent times. It has become common to apply law to get away with what one can, without regard to integrity. Integrity could be said to be hard to define or vague or open to interpretation. However, that is in part the point. We can not put on a piece of paper specifically what action is a right one for everybody.