Professor Lockhart is not a Death Eater
You no doubt remember the charming but utterly cutesy Professor Lockhart who in his time taught Defense Against the Dark Arts at Hogwarts. Arguably the most vain teacher in the history of the school of magic, Professor Lockhart was as much admired by Hermione and Mrs. Weasley as he was despised by the other members of the Weasley family and by Harry. The latter all considered him to be a notorious incapacitated incapable of teaching a subject which was nevertheless most important for young wizards.
But then why did Dumbledore recruit him when it is obvious to a knowledgeable wizard like the Hogwarts director that Professor Lockhart did not begin qualifying for this position? according to Wizardsandwhatsnot it is undoubtedly because Professor Lockhart poses no risk of being a Death Eater and of endangering Harry and his friends as Professor Quirell did! This explanation may seem a bit simplistic but it is not insane!
Cover image for Imgur