The possibility of the exercise of abusive power is present both from host to guest and from guest to host.
The rituals of hospitality are meant to disarm both sides so that the guest can express gratitude for, while the host expresses honor at, the presence of the guest in the host's domicile. Here is where grace serves as an instrument of security rather than as an instrument of justice.
Avraham is the host par excellence. He exemplifies hospitality for travellers, foreigners, strangers.