Whether we like it or not, we are a community. A person cannot hurt himself without hurting others. A father drinks too much. A son commits a crime. A daughter gets on drugs. A mother commits suicide. Everyone is a father, or mother, or daughter, or son. Or friend of someone.
Each person has a potential for good. If that person does damage to that potential, society suffers, for society cannot do good, only the people who make it up can do good.
As Donne said, none of us is an island; we are all part of the main. Who was it that said if you cut off a finger, you hurt the whole body?
For whom the bell tolls, by John Donne
"All mankind is of one author, and is one volume; when one man dies, one chapter is not torn out of the book, but translated into a better language; and every chapter must be so translated...As therefore the bell that rings to a sermon, calls not upon the preacher only, but upon the congregation to come: so this bell calls us all: but how much more me, who am brought so near the door by this sickness....No man is an island, entire of itself...any man's death diminishes me, because I am involved in mankind; and therefore never send to know for whom the bell tolls; it tolls for thee."