משך חכמה — מה בצע / ובוצע ברך נאץ ה'

Q — Why would anyone bless Yehudah for selling Yosef, and why is doing so considered ניאוץ of Hashem?

A — The OUTCOME of the sale was the saving of Israel from famine and the fulfillment of brit bein habetarim — but the INTENTION was evil; anyone who praises an act based only on its result while ignoring the corrupt intent is מנאץ ה', because Hashem cares about both — which is why עבירה גוררת עבירה דוגמתה led Yehudah straight into the parallel case of Tamar (good outcome of the malchut, bad intent of seeking a zonah).