It isn't and never has been. Making decisions under pretense of no emotions is itself an emotional decision. There's no escape and attempting to be emotionless is just selective blinders and contempt.
It's not thought at all. It's the experience of vicarious pain. It might even be the basis for our social tendencies. Best example I know of are neurological studies that suggest that witnessing footage of someone getting stabbed forces you to experience at least a tiny, compartmentalized version of the stabbing, even feeling it in the same spot. It's probably one of the most fundamental parts of the human experience but I personally don't understand it as something I do rationally, but in a good way, if that makes sense?