I am taking the position that the stopping of killing is due to the lack of weaponry that would make it easier than killing with their own bare hands. There is something a little weak in their faces , to me, that tells me that point hasn't been reached yet, but it isn't improbable that it will be reached at some point. I certainly don't think they stopped killing out of a sense of remorse or disgust with themselves. Robbery , I think ,was a by product of the murders, and why not? there is the stuff, the owner of it is dead, they need it, they take it. It's a simple , logical process.
Even if that wasn't the conscious process, I reckon it was , subconsciously. Three people , with a bit of a gap inbetween, one a woman, … that is people determined to kill, come what may.