What did edward believe was the reason the volturi wanted to destroy the cullens?

Well, honey, Edward believed the Volturi wanted to destroy the Cullens because they saw Renesmee, Bella and Edward's half-human, half-vampire daughter, as a threat to their secret vampire world. Those Volturi folks sure can be touchy about their power and control, can't they? But hey, can you blame them for being a little scared of a cute hybrid baby with crazy powers?