Someone once zei that Bonnie was responsible for grams death, is this true?
Scene 1 (Grams house) 1x14

Elena - "We need to let him have Katherine back. He's not gonna stop until he gets her, if we help him maybe that ends it."
Bonnie - "No he doesn't deserve to get what he wants."
Elena - "What other choice do we have."
Graham -" ...... I'll open the tomb, u get your brothers girl and destroy the rest with fire. Then this will be all over."

Fact 1 Bonnie didn't want to help.
Fact 2 Grams agreed that she would open the tomb, with no influence from Bonnie.

Scene 2 (The Tomb)

After the tomb was opened,...