what is the purpose of friar francis deception about heros supposed death? in act 4

Friar Francis tells Leonato to pretend that Hero has died of shame. He tells Leonato that if Hero pretends to be dead, instead of remembering her dishonor people will pity her and even Claudio will regret his words. Benedick promises to keep the secret as well, in spite of his intimacy with Claudio.