Blondie is Traveler 438, and the Director, their Boss still in the future, sending back still more Travelers, is immune to changes to the time line, and can get pissy when the future around him, her or it reconfigures because of choices made by his, her or it's time agents in the past go a little cockeyed. So yeah, it's probably a moral choice to only use those that should have died, but because the Director is aware of his her or it's own present (in the future) still being shit and still in need of further alterations in the past to make everything more better, he she or it is going to keep Ahabbing it until the future is wonderfully perfect.
Souls are made up, hippy bullshit, so what is being sent back in time are recordings of human personalities using human technology. Now I'm wondering if the Director is recording human consciousnesses off still alive people in the future, or if he, she or it, just found a server farm place-holding for cyberheaven full of digitized personalities. I'm wondering if the Director is AI, so I'm also wondering if the Director is from a lot further into the future than from where he, she or it is conscripting digitized humans from, since Blondie is a doctor, because there's one thing I know about most apocalypsese is that Schools tend to close down as society falls.
The present around the Director is constantly changing depending on what the 1000 time agents that he she or it sent into the past, whereafter he rewards or punishes those time agents accordingly to the success or failure of their missions. Oh. They can't fail. A messenger will be sent back to tell them that they are on a path to failure and they should re-access their judgement... The reason (maybe?) for the compartmentalization, is that there might be a 1000 time agent/travelers at any point in the past, but what if the Director only has 50 digital recordings of the same 50 people that he, she or it can send back in time? That's a good reason not to talk to other groups if there are three hundred copies of your personality walking around Earth at any one point who might be bummed to discover that they are not unique and special.