"Temporal bullshit might mean you're covered on that front. Alternatively, it might fuck you up entirely, but it would be entirely probable that that was how the timeline always had to go and changing it to a more advantageous option would completely doom your timeline to destruction."

He isn't sure about his world now. Dave said it was the Alpha timeline, that things were right. So maybe they were all meant to die no matter what. It doesn't seem like there is much to lose in John trying to fix it.

"You might get returned to the exact moment you left from is what I'm suggesting."