(Based on Zera Shimshon Vol. 1 pg. 313)
It says in Mesechta Megillah (11A) Rav Nachman bar Yitzchak began (his drasha) on the Megillah by quoting the possuk (Tehilim 124/2) “If Hashem would not have been with us when a common man stood against us” – (Rav Nachman bar Yitzchak explained) a common man and not a king.
The simple understanding of this Gemorro is that Rav Nachman bar Yitzchak explained that the reason that Divine intervention was needed at the time of Mordechai and Esther was that a commoner was the one that confronted us and not a king.
Zera Shimshon asks that is completely illogical! It would seem that a bigger miracle is needed when a king with his whole nation confronts Clal Yisroel than when a simple commoner confronts us. .
Zera Shimshon therefore explains that Rav Nachman bar Yitzchak explains the word adam (common person) in this possuk not as a common person that refers to Haman, who was a simple commoner and not a king, but rather it is referring to the earthly side of the Jewish people, the part of us that the Yetzer Hora dwells (as opposed to our spiritual side).
At the time of the Purim Clal Yisroel bowed down to the idol of Nebuchanetzar. The Gemmoro explains that we only our outer limbs worshiped this idol but in our hearts and minds we still believed in Hashem. Hashem, therefore, didn’t annihilate us for that sin. However, if we would have believed in the idol when we worshipped it, then Hashem would have annihilated us.
We learn in Pirkei Avos that a sin brings on more sins. Meaning, that the tumah of a sin effects us so much that usual result is to do more severe sins.
Therefore, since that we started to worship the idol, even though only externally, then the tumah of that sin should have brought us to even more severe levels of idolatry until, Rachmona Litzlan, we would have worshipped the idol also in our hearts. This, chas v’sholom would have resulted in Hashem punishing us with annihilation .
Therefore Rav Nachman bar Yitzchak began his drasha on Purim that we have to realize what the situation was then, and to thank Hashem that H. saved us from our own actions (our Yetzer Hora) and stopped the downward spiral, that we ourselves started, that should have led to real idolatry worship and consequently to annihilation.
In the light of Zera Shimshon’s understanding of Rav Nachman bar Yitzchak, when we contemplate on the downward spiral of Clal Yisroel that started with the Enlightenment Movement, that didn’t directly object to keeping the Mitzvos but was nonetheless a slight sin, that ended in the near annihilation of our people in the Second World War we can understand and truly rejoice for the great miracle of Purim !
In the merit of learning the Zera Shimshon’s Torah on Purim, Hashem should send the great, complete, and final salvation to Clal Yisroel in general and a personal salvation to each individual member of Clal Yisroel!