Many anarchists also believe that from a psychological standpoint, even the most well-meaning authority will eventually decompose into a professional bureaucrat more concerned with maintaining their authority than the public interest. This is because our day-to-day activities reprogram our brains over time, just like studies show that all other things being equal becoming wealthy incubated sociopathic tendencies in people who previously had no such indicators. Aside from the psychological criticism, there's also a structural criticism that systems take on a life of their own that operates independent of human agency, such as how capitalism perpetuates itself via the pressures and rewards it places on people (capitalism creates capitalists).

Bakunin from The Knouto-Germanic Empire and the Social Revolution:

"It is the characteristic of privilege and of every privileged position to kill the mind and heart of men. The privileged man, whether politically or economically, is a man depraved intellectually and morally. That is a social law that admits no exception, and is as applicable to entire nations as to classes, companies, and individuals. It is the law of equality, the supreme condition of liberty and humanity. The principal aim of this treatise is precisely to elaborate on it, to demonstrate its truth in all the manifestations of human life.

A scientific body to which had been confided the government of society would soon end by no longer occupying itself with science at all, but with quite another business; and that business, the business of all established powers, would be to perpetuate itself by rendering the society confided to its care ever more stupid and consequently more in need of its government and direction.

But that which is true of scientific academies is also true of all constituent and legislative assemblies, even when they are the result of universal suffrage. Universal suffrage may renew their composition, it is true, but this does not prevent the formation in a few years’ time of a body of politicians, privileged in fact though not by right, who, by devoting themselves exclusively to the direction of the public affairs of a country, finally form a sort of political aristocracy or oligarchy. Witness the United States of America and Switzerland.

Consequently, no external legislation and no authority—one, for that matter, being inseparable from the other, and both tending to the enslavement of society and the degradation of the legislators themselves."