Because political systems are not purely ideological. They are derived from a material (economic) basis and must satisfy existing relations to production or change them. In our case the two primary relations to production are those who own the means of production and those who produce. Under the economic base of capitalist production there are multitudes of political superstructures but you will be most familiar with the liberal democracy. This form of political structure provides some extra freedoms and luxury to its domestic working class but is only able to do so while maintaining the infinitely expanding profits demanded by capitalist production by exploiting a foreign working class for cheap labor. When the cyclical crises of capitalism eventually places an insurmountable strain on the liberal democratic political superstructure which can no longer hide or balance the class contradictions at its base you get one of two things. Communism or fascism. In the case of fascism it is essentially the owning class going all in, exploiting a foreign working class stops being enough so their imperialism turns inward on their own working class. Since they cannot increase oppression on every worker without inciting revolution they pit one section of the working class against another often along ethnic lines but who is pit against who is arbitrary. An out-group is intentionally created and alienated so that the owning class can maintain economic power. In the case of communism/socialism it is basically the workers taking full control of the economy and political superstructure because the capitalist class failed to maintain it. There is also anarchism but I am not well read enough to speak on it too much.
In short, western liberal democracies have essentially only two classes and the economic contradictions that the state exists to mitigate originate from a conflict of interest between these classes. If we are to be frank there is only the dictatorship of the bourgeoisie, the dictatorship of the proletariet, and classless society.
I hope this isn’t too much of a ramble lol, my partner was watching tiktok so I was a tad distracted.
Closest I got to a hobby is reading a shit ton of books. Highly recommend listening to an audiobook while you read a physical copy, cannot stress enough how much this helps me focus.