They feel compelled to rescue the bad guy and recover him.
I had a teen crush 10,000 years ago on someone who was an alcoholic at age 16 and I thought that he was worth rescuing. I did try a little as he was a lovely human being when sober but so messed up. Daddy had so much money and so much influence in the community. Never completely understood the dynamics in that family. Don't know that alcoholism was fully recognized then.
Fortunately, I never got any further opportunity and I heard that he never got his act together. Really sad thinking about the waste of that individual.