We essentially learn this life survival skill from people who have it. Amazon lists a sample chapter that may provide additional clarity. We also have a chapter The Dark Side of Empathy that teaches how to protect yourself. Absolutely, I say in the book that Adolph Hitler had empathy. Bill Clinton has been called Mr. Empathy.
Good salesman have empathy, remember it is every day mind reading.
The person with the greatest capacity for empathy always wins out in the end. He used his information to manipulate, lovers do this all the time. That is why empathy leads to real love not image love. So, empathy can be a form of manipulation. People can read the other accurately and then use that info to hurt or to help.