People always say that one's action should not be aimed at disabling others to take their own actions, and the former is often subject of general denouncement. For example, when a pianist plays piano in his neighborhood at midnight and disturbs another person's sleep, people would say that playing piano is more of a disturbance than sleeping, and so one should avoid playing piano when someone else is sleeping. What is the intrinsic difference between the two? Cannot I say that the sleeping makes it inconvenient for the pianist to play piano, and so one should not sleep when someone else is playing piano? What is the logical basis of making any of such judgements?