In most of the Terminator movies, Terminators are shown killing numerous people who get in their way, without remorse. They also kill anyone who tries to help their target.

So after terminating John Connor in Terminator: Dark fate, why was "Carl" shown to have developed an affection for humans? In Terminator 2: Judgment Day, the justification given was that the T-800 had been reprogrammed, and hence was able to have some emotions. But how did "Carl" -- a machine who just killed a kid in cold blood -- suddenly feel affection for a woman he found randomly?