Hey, I didn't say causal loops were *bad*. I loved Animal Man. :-) Just saying, "effects without causes" includes interactions between alternate timelines, and pretty much any instance of changing the past. They can make for great stories, but do have that weakness from a scientific perspective.
The "wave won't hit the 31st Century for another 45 mins" thing, on the other hand, I would class as absolute nonsense--not merely scientifically iffy, but too meaningless to even have value as a story. I don't even know how I'm supposed to *feel* about the "ongoing destruction of the past", although I gather that it's bad.