Advanced civilisation and a rogue planet approaching

First, a little background information.
For the purpose of my story, I'm making the Earth uninhabitable, similar to this question.
This is to cause a mass exodus from the solar system through a bit of fantasy science of artificial wormholes for interstellar travel.

From other questions like this one, I think it wouldn't too far out there to suggest that a rogue planet could pull Earth out of it's current orbit. But...
Would it even be reasonable that a civilisation capable of creating artificial wormholes couldn't stop a rogue planet?
Could there be a reason why they wouldn't be able to stop it, an excuse? Or should I just look into blowing up the sun instead?

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Advanced civilisation and a rogue planet approaching

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