From THUS SPEAKS THE BIBLE by Shabbir Ahmed, M.D.
How to get rid of the collective sins of a community. Let a goat die of thirst and hunger :-)
16:21 And Aaron [or the priest in later generations] shall lay both his hands upon the head of the live goat, and confess over him all the iniquities of the children of Israel, and all their transgressions in all their sins, putting them upon the head of the goat, and shall send him away by the hand of a fit man into the wilderness:
16:22 And the goat shall bear upon him all their iniquities unto a land not inhabited: and he shall let go the goat in the wilderness. [Why, then, was Jesus required to give his life?]