And if you are a good surgeon for example, you don't let emotions interfere with your decisions and actions during surgery either, but a mother of three dying on the operating table, with nothing even the best surgeon in the world could have done better, still sucks, while seeing a family break out in tears of joy when seeing a patient again after a surgery that went well, that still feels great.

There's a difference between handling something professionally, or not endulging in it, and not feeling anything at all.