Most started life as legitimate complaints

From The Persistence of Ideology by Theodore Dalrymple. A very informed and closely argued essay. Well worth a read.

At the end of his essay, however, Fukuyama—more concerned to understand the world than to change it, by contrast with Marx—implicitly raised the question of the role of ideology in the world’s moral economy. With no ideological struggles to occupy their minds, what will intellectuals have to do or think about? Virtually by definition, they like to address themselves to large and general questions, not small and particular ones: as Isaiah Berlin would say, by temperament, they are hedgehogs, who know one large thing, not foxes, who know many small things.

[snip]

As it turned out, of course, we did not have long (let alone centuries) to suffer existential boredom. Our dogmatic slumbers—to use Kant’s phrase for the philosophic state from which reading David Hume roused him—had barely begun when a group of young fanatics flew commercial airliners into the Twin Towers and the Pentagon, thus demonstrating that pronouncements of the death of both ideology and history were somewhat premature.

In truth, we should have known it, or at least guessed it, without needing to be reminded. Fukuyama’s concluding sentences contain a hint of the psychological function that ideology plays. It is not just disgruntlement with the state of the world that stimulates the development and adoption of ideologies. After all, disgruntlement with society there has always been and always will be. Dissatisfaction is the permanent state of mankind, at least of civilized mankind. Not every dissatisfied man is an ideologist, however: for if he were, there would hardly be anyone who was not. Yet ideology, at least as a mass phenomenon, is a comparatively recent development in human history.

Who, then, are ideologists? They are people needy of purpose in life, not in a mundane sense (earning enough to eat or to pay the mortgage, for example) but in the sense of transcendence of the personal, of reassurance that there is something more to existence than existence itself. The desire for transcendence does not occur to many people struggling for a livelihood. Avoiding material failure gives quite sufficient meaning to their lives. By contrast, ideologists have few fears about finding their daily bread. Their difficulty with life is less concrete. Their security gives them the leisure, their education the need, and no doubt their temperament the inclination, to find something above and beyond the flux of daily life.

[snip]

Benda meant something much wider by it, though support for Communism would have come under his rubric: the increasing tendency of intellectuals to pursue lines of thought not for the sake of truth, or for guiding humanity sub specie aeternitatis, but for the sake of attaining power by adopting, justifying, and manipulating the current political passions of sections of humanity, whether national, racial, religious, or economic. The political passions that Benda most feared when he wrote his book were nationalism, xenophobia, and anti-Semitism, which then had plenty of intellectual apologists, and which indeed soon proved cataclysmic in their effects; but really he was defending the autonomy of intellectual and artistic life from political imperatives.

[snip]

Ideological thinking is not confined to the Islamists in our midst. The need for a simplifying lens that can screen out the intractabilities of life, and of our own lives in particular, springs eternal; and with the demise of Marxism in the West, at least in its most economistic form, a variety of substitute ideologies have arisen from which the disgruntled may choose.

Most started life as legitimate complaints, but as political reforms dealt with reasonable demands, the demands transformed themselves into ideologies, thus illustrating a fact of human psychology: rage is not always proportionate to its occasion but can be a powerful reward in itself. Feminists continued to see every human problem as a manifestation of patriarchy, civil rights activists as a manifestation of racism, homosexual-rights activists as a manifestation of homophobia, anti-globalists as a manifestation of globalization, and radical libertarians as a manifestation of state regulation.