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Doctor Of Cerumen
Depends on the field. A Ph.D. who devotes their life to research in a field such as Pathology, Microbiology, Biochemisty, or Genetics (to name a few) absolutely saves lives. They just don't get the instant gratification of stepping up and doing so in a life or death situation. At the same time, the likely never have to go to bed wondering if they did enough to save someone's life that particular day.
Agree with you on the PhD front. But let's be honest about it, most doctors are not in the life saving business. Many of us re-arrange things here and there for people to make them feel better or prevent disease in the future. It is rare to truly save a life in the sense most people think of it. I work in a field that can have immediate and grave airway problems and I can think of only three times where my presence alone prevented someone from dying. I've done many operations to help with issues, but only three times where people were literally dying in front of my eyes. That never happens in most fields of medicine and rarely in mine (thankfully).