Cruelty as a Strength?

I'm going into biostatistics -- I'm avoiding med school specifically because
I'm not into the empathy game of feeling sorry for the starving baby whales
of the Amazon.

But as the old adage says, "turn a weakness into a strength."  Are there
topics of medical research where having a stone heart is an asset?  Maybe
something along the lines of pediatric pain management, death rates of
pediatric cancer patients, stuff like that.

Thanks