The Volturi want to fall again on Plan B after Caius kills Irina for falsely reporting Renesmee as an immortal kid. Whilst they could also be power-hungry vampiric dictators, they prefer their topics ignorant of (or a minimum of unwilling to combat towards) their manipulative video games to safe persistent. When folks really feel oppressed, they are some distance much more likely to band in combination to take down a tyrannical executive. If the Volturi can say, “Neatly, they attacked first when we performed justice,” then they are able to paint themselves because the heroes.
When that does not paintings, they transfer on to Renesmee. The Cullens have simply confirmed that she’s no longer an immortal kid (a kid was a vampire via a chew). However the Volturi are fast to indicate that they know not anything of Renesmee’s species, which might pose a identical chance to the immortal youngsters who, at one time, threatened to disclose the life of vampires due to their impulse regulate. Given vampire historical past with those youngsters, it would not be tough for the Volturi to persuade their topics that that they had to kill Renesmee to be secure.
So why, then, do they so simply permit her to get away the scene with Jacob? No person tries to move after her, and Jane does not strive to torture Jacob so somebody can snatch Renesmee. If the Volturi need the higher hand, all they’ve to do is make an actual transfer towards Renesmee ahead of the struggle starts. She’s everybody’s blind spot, and going to excessive lengths to save her could be sufficient for quite a lot of Cullens to make a sloppy mistake that cannot be retconned in a imaginative and prescient.