Try becoming one these professions that you mentioned or another helping professional (therapist, teacher, teen advocate, non-profit programmer, etc) and see if you can NOT care about the people you are helping or educating or advocating for. I spend countless hours working with teens on the job and when I come home I still think and worry about them. Of course they care. Sure it's in the job description.. but if the professional didn't want to care for people and about people, they would not have chosen to work in the helping profession.