People differ in where they direct their empathy and their compassion. Many people are intensely concerned about the suffering of non-human animals, and some do not care at all. There are cultural differences.

My brother is severely autistic, so when I was a kid I spent a lot of time as a teenager in camps and programs for autistic kids. When I went to McGill as an undergraduate, I figured I'd be a therapist working with these kids. The truth is, and I knew this even back then, I'm just not good at this. I'm too empathic to do this sort of thing.

I think there's some evidence that when it comes to being a doctor or nurse, a police officer or therapist, that empathetic engagement leads to burn-out. Imagine if you're dealing with severely ill children, and you felt their pain all the time, and the pain of their parents - you wouldn't be able to do that job for very long. It would kill you.

When people want to inspire you to turn against some group of people, they'll often use empathy. When Obama wanted to bomb Syria, he drew our attention to the victims of chemical warfare. And in both of the Iraq wars, politicians said, "Look at the horrific things that are happening." I'm not a pacifist. I think the suffering of innocent people can be a catalyst for moral action. But empathy puts too much weight on the scale in favor of war. Empathy can really lead to violence.

Because of empathy, we care more for, and devote far more resources to, someone who is familiar, from our country or our group, than a stranger.

For the most part, people use "empathy" to mean everything good. For instance, many medical schools have courses in empathy. But if you look at what they mean, they just want medical students to be nicer to their patients, to listen to them, to respect them, to understand them. What's not to like? If they were really teaching empathy, then I'd say there is a world of problems there.

I think we should really discourage this sort of empathic engagement when it comes to making moral decisions. I think we should focus on something like compassion, on getting people to care more for others without putting ourselves in their shoes.