I “left the left” about a decade ago but, in retrospect, I think I was starting to have inklings of how so many who I associated with who were quick to declare themselves “progressive” seemed to combine sanctimony with authoritarian impulses and I started to wonder “where have I seen this before?” So, given my natural inclination to distrust self-appointed busybodies of the “public good” plus the fact that I seemed to know an awful lot of really resentful and childish wackjobs who identified as progressive, I started to quite unintentionally drift rightward.
This was hastened even more by the fact that my inherent biological characteristics put me in the “out” group of the progressive left (being ostensibly a cis-straight-white male).