I never saw The Waltons, but the 1970s was one of the most "woke" periods in TV history (in relation to American culture at the time). Most shows were pushing liberal politics, some more explicitly than others.
Norman Lear's shows (All in the Family being his flagship show) were blatantly and proudly political. But even MTM's The Mary Tyler Moore Show had the occasional messaging.
ABC’s “Kung Fu’’ was VERY preachy.
Yep, the Rural Purge. I suppose The Waltons was an attempt to cater to those who were outraged by it.