To assess political parties according to the criteria of truth, justice and the public interest, let us first identify their essential characteristics.
There are three of these:
A political party is a machine to generate collective passions.
A political party is an organisation designed to exert collective pressure upon the minds of all its individual members.
The first objective and also the ultimate goal of any political party is its own growth, without limit.
Because of these three characteristics, every party is totalitarian – potentially, and by aspiration. If one party is not actually totalitarian, it is simply because those parties that surround it are no less so. These three characteristics are factual truths – evident to anyone who has ever had anything to do with the every-day activities of political parties.
As to the third: it is a particular instance of the phenomenon which always occurs whenever thinking individuals are dominated by a collective structure – a reversal of the relation between ends and means.
Everywhere, without exception, all the things that are generally considered ends are in fact, by nature, by essence, and in a most obvious way, mere means. One could cite countless examples of this from every area of life: money, power, the state, national pride, economic production, universities, etc., etc.
Goodness alone is an end. Whatever belongs to the domain of facts pertains to the category of means. Collective thinking, however, cannot rise above the factual realm. It is an animal form of thinking. Its dim perception of goodness merely enables it to mistake this or that means for an absolute good.
The same applies to political parties. In principle, a party is an instrument to serve a certain conception of the public interest. This is true even for parties which represent the interests of one particular social group, for there is always a certain conception of the public interest according to which the public interest and these particular interests should coincide. Yet this conception is extremely vague. This is true without exception and quite uniformly. Parties that are loosely structured and parties that are strictly organised are equally vague as regards doctrine. No man, even if he had conducted advanced research in political studies, would ever be able to provide a clear and precise description of the doctrine of any party, including (should he himself belong to one) of his own.
People are generally reluctant to acknowledge such a thing. If they were to confess it, they would naively be inclined to attribute their incapacity to their own intellectual limitations, whereas, in fact, the very phrase ‘a political party’s doctrine’ cannot have any meaning.
The goal of a political party is something vague and unreal. If it were real, it would demand a great effort of attention, for the mind does not easily encompass the concept of the public interest. Conversely, the existence of the party is something concrete and obvious; it is perceived without any effort. Therefore, unavoidably, the party becomes in fact its own end.
This then amounts to idolatry, for God alone is legitimately his own end.
The transition is easily achieved. First, an axiom is set: for the party to serve effectively the concept of the public interest that justifies its existence, there is one necessary and sufficient condition: it should secure a vast amount of power.
Yet, once obtained, no finite amount of power will ever be deemed sufficient. The absence of thought creates for the party a permanent state of impotence, which, in turn, is attributed to the insufficient amount of power already obtained. Should the party ever become the absolute ruler of its own country, inter-national contingencies will soon impose new limitations.
Therefore the essential tendency of all political parties is towards totalitarianism, first on the national scale and then on the global scale. And it is precisely because the notion of the public interest which each party invokes is itself a fiction, an empty shell devoid of all reality, that the quest for total power becomes an absolute need. Every reality necessarily implies a limit – but what is utterly devoid of existence cannot possibly encounter any form of limitation. It is for this reason that there is a natural affinity between totalitarianism and mendacity.
https://theanarchistlibrary.org/library/simone-weil-on-the-abolition-of-all-political-parties