Why did people after world war ii believe that conservatism was "a relic of a discredited past"?

People believed that conservatism was "a relic of a discredited past" as it supported anti-Semitism, had a preference for a social hierarchy as well as a proclivity for conspiracy theories which were now deemed a thing of the past. Conservative parties across central and eastern Europe were destroyed or co-opted by the totalitarian regime of Nazi Germany in the period  leading to World War II

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.