There are plenty of jobs out there I couldn't imagine doing, but are a necessary service to society/our communities.
Personally, I couldn't be a doctor performing abortions but that is because I couldn't be a doctor at all - to either humans or animals - because I can't handle blood/surgical situations (unless it's my own blood) and needles really gross me out. Being a surgeon or assisting in surgeries is something I could never do because of how much it disturbs me - but surgeons are needed.
Other people whose jobs I could never do: police officer, paramedic, firefighter, farmer, airplane pilot, butcher, fisherman, garbage collector.... I could go on and on.
I'm glad there are people with stronger stomachs who will do the jobs I can't imagine doing. Thank goodness for all of them!