The suffix -ism is one of those handy things inherited from the versatile Greek language. The original usage was the creation of an active noun from a verb, such as baptism or criticism. It makes an action into a thing, allowing it to become a subject or object.
More recently, this suffix has taken on the use of defining a philosophy, often a political practice. It is a way of taking a series of beliefs or practices and putting them into a box which can be delivered as one unique practice. Far from making an active subject, in practical terms it becomes most useful as a way of preventing any action at all.
The great -isms of political economics are Socialism and Capitalism. The boxes these words describe were fixed long ago and remain rigid. Yet they retain their power to an opposing tribe and thus remain in use. It’s long past time to dump the -isms, useful as this linguistic construction once was.