Has there been significant change in the underlying trends where reactionaries are pessimistic about inherent human nature, consider it basically impossible to change significantly, and consider the problem of developing social mechanisms to control it something vital to social stability that takes generations and centuries to solve and is likely to end up with constraining and unintuitive solutions which will nevertheless be the best bet available, while progressives are optimistic that human nature is either benign or malleable enough that it's possible to enact large and fast social changes and eventually educate people to make the new system work across the board, without messy, nasty and basically impossible to change facets of human nature ending up causing persistent problems?