Abimelech fought against the city all that day; and he took the city, and killed the people who were therein: and he beat down the city, and sowed it with salt.
In other words, he's an outsider. We ought to be serving Hamor and his family, let them be the kings. And he said to God the people were under my rule, because I can really do a good job here, you know. Who's Abimelech? And so he said if you would just commit yourself to me I would remove Abimelech.