Honest about what? I have all your memories, Hermione. What are we going to talk about? The fact you three have declared yourselves judge, jury, and executioner?
'What needs to be done'? About what? A branch of terrible Dark Magic that almost no one not Voldemort would consider using? Whose mechanics were probably destroyed by your future self when she packed everything up and hid it? A few relics whose legends have no basis in fact? Not even your memories present one shred of evidence they do what they're supposed to do.
So, you'll have to forgive me if I feel insulted you three would dare to presume you have the right to invade my mind over a secret whose biggest danger is what you seem willing to do to protect it.