From Rabbi Avi Weiss:

In this week’s Parsha, Chaye Sara, Avraham instructed Eliezer to find a wife for Yitzchak from Aram. Commentators ask why Abraham the Patriarch preferred a wife from his birthplace for his son Isaac rather than a woman from Canaan. After all, both were places of idolatry, and Abraham and Isaac were living in Canaan.

Rabbeinu Nissim answers that in Canaan, people mistreated each other. In Abraham’s birthplace, they may have sinned against God, but there was respect and love between people. Avraham recognized that Derech Eretz (respect) is the prerequisite to any lasting relationship, both among people as well as between us and G-d.