Considering the events of Riverdale Season 1, it’s safe to say the Blossom family has a history of dark behavior, which could be further detailed in future episodes should Betty decide to explore the origin of her dark urges.
Roberto Aguirre-Sacasa’s hint that Betty’s dark urges may be genetic is an interesting spin, considering there’s still a bit to unravel about the Cooper family that Riverdale fans have only been teased with.
In Season 1, it was revealed that the Cooper family was created a couple of generations ago when a murder within the Blossom family caused a portion of the clan to change their name.