Once he releases the names he is no longer safe.
Safe from what? Once he releases the names, they can’t be called back and there will be no reason to harm him. This is just a publicity-seeking lawyer.
I think the opposite is true. He's only dangerous to those on the list as long as the list is secret. Once he releases the names he's safer than he is now. If he doesn't release them he'll probably commit the same kind of 'suicide' that Ms. Palfrey did.