RAV KOOK ON Shemini Part 2: Mourning for Nadav and Avihu

After the tragic deaths of Aaron’s sons Nadav and Avihu, Moses instructed Aaron and his remaining sons not to display any public signs of mourning: “Do not let your hair grow untended, and do not rend your garments.... And as far as your brothers are concerned, the entire house of Israel will mourn the ones whom God has burned.” (Lev. 10:6) Why was Aaron not allowed to publicly mourn the death of his sons?