No killing or saving people from the past....but
Time travel is always an interesting topic but something about this show, which I did enjoy, has had me thinking.
One of the protocols is the travelers aren't to save or kill anyone so they don't change the future but when a traveler takes over the body of a host who was meant to die aren't they technically saving them? As far as Kat knows her husband never died, Trevors parents never mourned their sons death because they never had to and the list goes on for every host who has a traveler taking over their life and assuming their roles like nothing happened to them. Friends and family notice changes in their personality but they have had their futures changed by never experiencing the deaths that should have happened. Surely they are tampering with the past by doing this?