Emotions that accompany the two main complementary conservative and liberal ideologies of civilization are the complementary emotions of free choice and compassion. All emotions come from the primitive and not the rational conscious mind, but emotions are why we feel the way that we feel and are why we do what we do.
Conservative ideology favors more individual free choice with limited government coercion while liberal ideology favors more government coercion with limited individual free choice. Extreme conservative ideology with unfettered free choice then suppresses liberal compassion and will end up despotic and tyrannical. Likewise, extreme liberal ideology with unfettered compassion then suppresses conservative free choice and will likewise end up despotic and tyrannical.
Thus Nazism or Fascism represent a conservative extreme unfettered free choice by a ruling elite, while socialism or communism represent a liberal extreme unfettered compassion by a ruling elite and have both demonstrated despotic tyranny outcomes. Despite having opposite feeling precursors of free choice or compassion, respectively, both conservative and liberal extremes both end up as despotic tyrannies. This is also why successful free market capitalism must always tolerate some political and religious dissent and thus have necessarily more representative democracy outcomes.
The balance between the callous free choice based on the feeling of an individual and the compassionate coerced choice of state has been a long struggle for civilization. Ancient China, India, and Rome all achieved some success as totalitarian states rule by the unfettered free choice of their ruling classes and a fundamental acceptance and indeed promotion of the suffering and misery of everyone else. Then, Western civilization grew to adopt a Judeo-Christian-Islamic ethic that introduced the primacy of individual free choice for most people as a a different feeling with more compassion for those outside of the ruling class. In particular, the Judeo-Christian ethic taught that both rich and poor people have the same free choice of grace and salvation and therefore both could reach heaven by their own free choice. People did not have to accept their suffering and misery, but could choose different destiny from that of their birth. The Judeo-Christian-Islamic ethic shows the primacy of individual free choice and free choice gave rise to the innovation of technological advances that increased the wealth of all people, including the poor, and gave rise to a middle class as a result.
China’s CCP is a very good example of unfettered compassion of a ruling class since the CCP uses their unfettered compassion to justify tyranny over everyone else. The unfettered CCP compassion considers itself virtuous because it has good intentions for most people, but the CCP cannot tolerate any religious or political dissent and so mercilessly suppresses the free choice of both religious and political minorities. The CCP is now actively suppressing all non-state religions, Uighurs, Tibetans, Falun Gong, Hong Kong, and Taiwan.
Syrian Assad’s ruling class represents callous free choice that likewise cannot tolerate any dissent and Assad’s nine-year long civil war ruthlessly suppresses all religious and political dissent. Likewise Iran's theocracy callous free choice likewise cannot tolerate any dissent in Iran and ruthlessly suppresses all political and religious dissent outside of the ruling theocracy.
All of these examples of one-party rule are at the extremes of either callous free choice or unfettered compassion.