You Had to Be There: Moshe’s Final Rebuke and the Cost of Absence

Parshas Devarim begins Moses’s month-long speech to the Israelites just before he dies and they enter the land of Israel. Moses recounts significant events, expounds on mitzvahs, and relates prophecy. But famously, Moses starts with rebuke of all the Israelites before him. Literally all of the Israelites. All three million. Was it so necessary that they all needed to be present?