Look at the great tradition of Western political philosophy. Those people were all immersed in revolutionary movements. Most weren't career academics - often, they were too radical to be accepted in the academy. Rousseau's books were banned. Jeremy Bentham and John Stuart Mill couldn't hold academic positions because they were atheists.
Hilary Putnam died of cancer at the age of 89. Those of us who had the good fortune to know Putnam as mentees, colleagues, and friends remember his life with profound gratitude and love, since Hilary was not only a great philosopher, but also a human being of extraordinary generosity, who really wanted people to be themselves, not his acolytes.