Yes, it’s mildly awful. Or at least the implications are. Gotta give the PCs a suitably awful Ultimate Big Bad to aim for, right?
The Great Drone Wars of 800 AD
Well, it’s like this. Time travel is possible, you can change the past, but it doesn’t effect anything that happens back in your home time period. The nations of the world — at least, the ones whose governments survived any number of revelations by people raiding the recent past for evidence of awkward or illegal shenanigans — have banded together to create an international organization dedicated to making sure that all the awful consequences of time travel stay strictly Downtime, and never impacts Uptime (currently 2057 AD) at all. OK? OK.