Wherever you look in history, the world's most damaging decisions have all been made by conservatives. Conservatism is at the root of every major problem humanity faces.
It's in the name, conservatism is the opposite of progressivism, progress is a natural state, nothing stays as is forever, the only way to stop progress is to go against nature.
"Change" is the natural state, and not all changes are "progress".
Conservative used to be "want to take things slow to see which changes are good and which are bad".
Stagnatives and Retrogrades should be separate categories.
Indeed it is. Nurgul is the Chaos God that is in charge of natural cycles of death decay and rebirth. His followers spread diseases all over the place. Though now that I think about it Tzeench is in charge of "change," IIRC.
If The Emperor Had a Text To Speech is a remarkably close to canon primer for the universe, if a bit tongue in cheek.
Honest question since I consider myself insufficiently informed on the topic. How do you account for the various Communist dictators over the last century, and the genocides or famines or other things caused by them? I know a lot of those honestly come back to US interventions, but not all of them?
Communism is not inherently left-wing. While there have been left-wing supporters of communist styles of governance, right-wing authoritarians have also adopted communism. China's leadership is one such example.
In the case of Marxist-Leninist "tankies" supporting communism, remember that authoritarianism and dictatorships are antithetical to leftism/progressivism by definition, making these tankies right-wing/conservative by definition (as right-wing ideology supports authoritarianism and dictatorships).
When a conservative equates communism with leftism (or makes any other illogical comparison), it's important to remember that every word uttered by a conservative is misinformation, deception or manipulation. Conservatives are always either victims of misinformation or are the intentional spreaders of misinformation. Always.
That is just the nature of conservative communication. Conservatives lead other conservatives by manipulation, which includes using misinformation to create fear and confusion. This leads to profound misunderstandings of concepts like communism, socialism or progressivism.