Have you ever read Michael Crichton's "State of Fear"?
There is an amazing number of people that believe they know what is "best" for "those other people". And far too many of them get elected to positions of power.
It can be rather amazing in hind sight what sounded "right" to people back in history.
Why Politicized Science is Dangerous
http://www.michaelcrichton.net/essay-stateoffear-whypoliticizedscienceisdangerous.html
Also see Eisenhower's Farewell Address 1961: