You are forgetting that we could "travel faster than light" using an Alcubierre Drive [1][2], or something similar. i.e. bending space so that our path is now shorter even though in our local space we are not traveling faster than light.
>>If we had FTL travel, we could outrace light waves, look back, and see events in the past. The we could race back and report what we saw. That's why it's not possible -- it violates some basic physical ideas about causality.
You are confused. You are not actually traveling to the past therefore causality is not a problem here.