"Sitcoms have always been zeitgeists of the era in which they were
created, clumsily tackling important issues with jokes while
simultaneously upholding the values of the time. The Mary Tyler Moore Show offered audiences an independent woman in the workplace after the rise of feminism in the late '60s, The Jeffersons
presented an African-American family finally "getting a piece of the
pie" by moving into a luxury apartment in Manhattan from a blue-collar
neighborhood in Queens and Bewitched confirmed what a dangerous decision it was for us to stop burning witches.
But when sitcoms so accurately reflect the collective climate of the time period in which they are created, you have to wonder why, then, networks decided the 1980s were a good time to start killing off moms."