Perhaps he just mainpulates Clara into being a person who cares alot about the living beings she happens to interact with, but still can make uncomfortable choices. This would be useful for him since she is supposed to save his lives over and over somewhere in time. He could easily "cheat" and look what consequences a given choice would have, since he has a time machine and a lot of spare time.
Or his basic values are alien to some of us.
His basic values are intended to be alien to us, but what they actually are is alien to the writers. Of course the values of lots of actual human beings are alien to the writers too.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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