What is the world's most powerful and violent “ism”?
The question will summon the usual demons such as Islamism, now that communism has left the stage. The answer, wrote Harold Pinter, is only “superficially recorded, let alone documented, let alone acknowledged”, because only one ideology claims to be non-ideological, neither left nor right, the supreme way. This is liberalism.
In his 1859 essay On Liberty, to which modern liberals pay homage, John Stuart Mill described the power of empire.