Aruch ha'Shulchan on Why We Don't Say Tachanun During the Month of Nisan

This evening (4/5/22), in our tefilah shiur, we were going to continue our analysis of Avos 2:13. However, I recently stumbled upon an eye-opening explanation from the Aruch ha'Shulchan for the (dearly beloved) practice of not saying tachanun for the entirety of Nisan, and I felt like I HAD to give shiur on it. I then realized that since "tachanunim" is one of the subjects of our mishnah, perhaps we could accomplish both objections in one shot. Did we succeed? You tell me!