Greetings, mysterious commenter! (I wonder who you might be?)

I agree that it is often fruitful to challenge toddlers to consider how other people are feeling. If you've over been whacked by a flying toy or gotten a hand stomped on as a toddler goes about her business in the playroom, and she doesn't take take note it could be for several reasons, including a lack of empathy or a failure to grasp cause-and-effect.

But I do think that toddlers can sometimes grasp the power explicitly.