I believe that the whole story based of a real happened. Do you know Hitler? he was a german man who was exactly like voldemort. He found an organisation that followed a certain race. The jewish people-or in the potter world the muggleborns.
Hitler created, like voldemort a special sign of his.
Killed peoples and familys and it all ends in a war.
(Hitler killed himself-thats the only thing whats not as voldy)
Okay hitler don´t want to kill a certain person... but... i find its a bit like this deatheater thing o.O