“Don’t abuse a stranger and don’t oppress him, for you were strangers in the land of Egypt.”
~ Exodus 22:21
Of many hundreds of commandments, only a handful offer reasons to keep them. Why’s one given here?
Moreover, Hillel encapsulated all of Torah into the famous principle: Don’t do to others that which you hate. So isn’t it obvious?
Because human relationships are matters of the heart, it’s easy to justify our bad behaviour through our own painful feelings.
The only cure for this insidious rationalization is understanding how you would feel if it was you on the receiving end.