I've had the same reaction to other 70s TV series that I enjoyed at the time (when I was just a youngster) but now in re-runs I can see that many were just vehicles for liberal propaganda. "All in the Family" is one of the foremost examples.
I love All In The Family
I never thought that way about 70s shows before, you may be on to something.
For example, 'The Brady Bunch' isn't really a pro-life show, it's propoganda for Planned Parenthood... Mike & Carol never had any more kids, did they?
'The Patridge Family' glorified teen sex, drugs, bad rock & roll and single moms.
And of course, 'The Odd Couple' was an attempt to get us to accept gay marriage.
;o)