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human
[Days of Future Past Movie] Why did they need Magneto?

So, Wolverine convinces Prof X and Beast to break out Magneto in order to stop Mystique from killing Trask thereby dooming them all, because future Magneto is like "you'll need me"

But did they really?  I mean he just made things worse. Not to mention the huge risk in breaking him out in the first place could have ended the whole thing right there and then.  

Was it all just so the two actors could be really intense at each other?
gpt
Originally they though that Mystique would only speak to Magneto, she was close to both Xavier and Magneto so she would listen to one of them. Magneto also showed massive flaws in the early Sentinel project, making it far less likely it would activate. 

Two birds with one time warped stone.