I do believe that your conjecture is correct about the reason for not having an extensive family group was that they took their babies from them. If you want to read what that was like for the elephants, read the book "Jumbo Ghosts" It was written by the man who was the veterinarian there, in Portland, at the time. It is horrifically eye opening. Nobody knows what animals think, we can only guess and see their reactions to the environment around them. Elephants are very highly evolved and deserve much more respect than they have been given. I saw a video of BABY elephants being BROKEN in Thailand and being beaten and stuck with sharp objects until their spirit was broken and they just gave up fighting for their lives. It was one of the worst things I have ever seen. It was torture, and justified by the people who did it for their own reasons and needs. Needless to say, it made us very hesitant about visiting Thailand until such things stop.