but perpetrated at scale on a large populous of second-class citizens (aka Muggles).

What do you mean?

But yeah, the obliviators have definitely been mindraping people, but even with that, they couldn't possibly track and trace all the people getting in on the secret.

Maths study shows conspiracies 'prone to unravelling

"Maths. A magic beyond all we do here at Hogwarts."