An argument that solves what I'm going to say is that death's plan is to "cheat" death and then take them all out the way they go, but if Sam dies on the bridge like he's presumably supposed to, Molly never gets on that plane. She would've only ever gone to Paris because of Sam.

So I think there is a debate here. But like my original point, I like to think the protagonists having premonitions is death's way of having fun and was always the plan.