False Realism and Utopianism
Conservatism is a defense of the existing order or past existing orders as "natural". Any potential alternative to the existing order or to the romantisized past order is immediately brushed aside as "unnatural" and "utopian" or "idealistic". In the conservative view, all existing inequalities are "natural" in a sort of deterministic sense. The conservative strongly emphasizes nature over nurture to explain and defend currently existing or past existing conditions. On the other hand, utopian left-wing ideologies such as Marxism strongly emphasize nurture over nature and hence attribute the vast majority if not all currently existing conditions and inequalities to political, economic and cultural influences in a deterministic sense. Nothing short of a significant transformation in human nature can possibly obtain the ultimate end sought of a purely egalitarian society, and the desirability and implications of such a purely egalitarian society is alarmingly questionable upon reasonable reflection.
The conservative errs in considering the existing order or past orders to be inevitable into the future or that they can possibly sustain themselves perpetually. They tend to ignore the extent to which inequalities are the effect of influences such as state intervention and bureaucracy. The conservative tends to defend the unequitable effects of state intervention as if they came about naturally on the free market, and therefore concludes that currently existing disparaties between various groups of people are both inevitable and justified. When anyone proposes or attempts to change such conditions or the existing order in general in a significant way, the status quo is defended by the conservative. The conservative has little to no concept of the dynamic nature of society over time and fails to see the potential changes that can be made and the advantages that can be reaped. Conservatism can be seen as a very pessemistic view in a sense, particularly pessemistic towards the future.
The marxist engages in the opposite error. They blame all existing inequalities and negative conditions on the non-existant free market and then arbitrarily proclaim that it's just a phase of history that will inevitably be surpassed by a collectivistic utopia, if only all the workers magically take over the state and somehow voluntarily dissolve it. The marxist does not recognize the degree to which state intervention is the primary cause or enabler of the inequities that they have so much distain for. They put themselves foreward as being proponents of change in the right direction, but what they ultimately have to offer is more of the same: state intervention and centralization. The actual cause of the problems which they aim to solve is precisely what they propose as a solution, and therefore their "change" isn't a meaningful or beneficial one. They propose what in some ways amounts to an authoritarian heirarchy as the solution to authoritarian heirarchy or dictatorship as a solution to dictatorship.
The distinction between and reliance upon nature and nurture is often a false dichotomy. That which involves human influence is often characterized as "nurture", yet human beings are a part and product of "nature". The real question is a matter of which particular parts or aspects of "nature" are influencing other particular parts or aspects of "nature". There are some issues with the use of the term "natural" to begin with. In a certain sense, everything and whatever the current state of affairs happens to be is "natural". The only alternative to something being "natural" would be for it to not exist, unless of course one is proposing that there is some kind of supernatural realm which would still ultimately reduce to non-existance. That being said, it is definitely nonsensical to consider all present conditions and all present forms of organization to be inevitable and a permanent state of affairs. Stasis is not "natural". Organizations and organizational forms are never permanent in the grand scheme of things, so it would be more genuinely "realistic" to propose that the eventual dissolution of the existing order is "natural" and inevitable at some point.
While the conservative puts themselves foreward as a realist, they are truly nothing but a proponent of either stasis or "turning back the clock" to "the good old days", which becomes their own romantic utopia. The extent to which they see current affairs as moving in an "unnatural" direction causes them to become reactionaries, desparately trying to cling on to old traditions. On the other hand, the marxist sees the present as "unnatural" and proclaims an inevitable utopian future to be a "natural" progression. They've drawn erroneous conclusions from the basis of the hegelian dialectic, philosophy of history and social evolutionary theory. Both involve the bastardization and politicization of science as a handy rhetorical authority and a misguided appeal to either nature or nurture.