It is necessary for the welfare of society that genius should be privileged to utter sedition, to blaspheme, to outrage good taste, to corrupt the youthful mind, and generally to scandalize one's uncles.
Knitters just can't watch TV without doing something else. Knitters just can't wait in line, knitters just can't sit waiting at the doctor's office. Knitters need knitting to add a layer of interest in other, less constructive ways.