The Bais Yaakov (son of the Izhbitzer) explains a deeper truth about sins against G-d and how they reconcile with a divine plan that can never be abrogated. In the parsha, Yosef explains to his brothers that they did not send him to Egypt but rather G-d sent him. What Yosef was trying to communicate to them was that even if they were sinning, their actions still aligned on a deeper level with a G-dly intent.