Feel free to protest the size of the remuneration with respect to the actual added value, and discuss the general adequation of the notion of salary with respect to human life and happiness. Not being such a philosopher myself, I'm sticking with what I have: fair, in what regards pensions, is proportional with the contributions, and you didn't make a case for the contrary. You could even argue why a university professor, or a physics researcher is better payed than a steel worker; you can make all the class war you like, which you'll undoubtedly do even when there will be no more workers left. But you do have your definition of fair.

Free at last! Free at last! Thank God Almighty, we are free at last! (Martin Luther King)