Unless they find a new time rift -- which is what I assume is in "The Badlands" -- they're fucked in the long-term.
I don't know why I watch the show. The concept is interesting but the show itself is such...mediocrity.
Or they were trying to go for consistency.
The back story afterall is that it's meant to be a New Beginning for Humanity, one in which the bad things we did to Terra Prime are'nt going to be repeated, and not killing animals when you can stun them or chase them away fits with that.