@Sheog
Because respect for others, empathy, integrity, and responsibility are literally the core values of being a Doctor. It then would come as no surprise that a Doctor has compassion and cares and has empathy for their patients?? It's in their nature.
They see patients (gleaning a history, family set-up, background) at the beginning of a journey (initial consultation for example) and see them through to the end, and along the way (hopefully successfully) remove the carcinoma/fix/repair/reconstruct/improve upon the patients body/wellbeing/life.
This is at the forefront of their minds whilst they operate, I can vouch for this as conversation in the theatre is quite often about how tragic the situation is or what family they have or how this patient has been battling. To say they only see patients as a number is actually disrespectful.
It gives incredible job satisfaction but also absolute heartbreak at unsuccessful cases.
I'm actually a bit baffled how anyone "can't see how they can be emotionally invested"
Can I ask genuinely why you think they aren't?
I speak in relation to the vast majority but I am aware (like in all health care roles) there are the odd few who you might say lack all empathy/are detached etc but even at that who are we, as observers to judge the intentions or emotional connection anyone has?