The 20th century’s most famous philosopher addresses this question: Why do philosophy, if none of its questions are answerable?
Related: Others in the Philosophers, Explained series:
Catharine MacKinnon on censoring pornography as violence.
Karl Marx and Friedrich Engels on overthrowing capitalism.
John Stuart Mill on free speech.
Benito Mussolini and Giovanni Gentile on the philosophy of fascism.
Friedrich Nietzsche on master and slave morality.