:ו. בְּסֹדָם אַל תָּבֹא נַפְשִׁי בִּקְהָלָם אַל תֵּחַד כְּבֹדִי כִּי בְאַפָּם הָרְגוּ אִישׁ וּבִרְצֹנָם עִקְּרוּ שׁוֹר
6. Let my soul not enter their counsel; my honor, you shall not join their assembly, for in their wrath they killed a man, and with their will they hamstrung a bull.
Right before Yaakov died, he gave blessings to each of his sons. However, Shimon and Levi were given a blessing that would seem to be negative, and a punishment for their actions against the city of Shchem. Yaakov says "Let my soul not enter their counsel." Why does Yaakov say this? What does it mean? What is this counsel he is referring to?
Rashi has an interesting interpretation on this:
Let my soul not enter their counsel: This is the future incident of Zimri (that Yaakov is referring to), when the tribe of Shimon gathered to bring the Midianitess before Moshe, and they said to him, “Is this one forbidden or permitted? If you say she is forbidden, who permitted you to marry Yitro’s daughter?” Let my name not be mentioned in connection with that affair. Therefore, the Torah depicts Zimri as “Zimri the son of Salu, the prince of a father’s house of the Shimonites” (Num. 25:14), but the Torah did not write, “the son of Jacob.” - [from Sanh. 82a, Gen. Rabbah 99:6]
As we see, Shimon and Levi did something worthy of their father's discomfort when being addressed. What are other interpretations of these words? Why does Yaakov seem to be giving these two sons a curse? What did these two brothers do that they deserve this? Is there any positive interpretation of such an outburst?