You make Roberston sound logical.
And then is the case where Abraham pleaded with God to not destroy the people if 20, no, 10, no 5 righteous people could be found. The implication is clear: had there been no bargaining, then 5, no 10, no 20 righteous people would have been destroyed for the sins of others.
You make Roberston sound logical.
Because there is logic to it. You don't have to agree with him, but he's no fool.
Your god, the Bible, is full of examples.