As I see it, all the employees working under the same CLA are collectively paying each other's pension. Simply because we, as a group, have forced the company to so so through collective negotiations.
A single pilot would never had the ability to negotiate a pension anywhere near the pension we now have in SAS. Or in any larger airline, for that matter.
Hence, if one pilot breaks the collective agreement by continuing to work after the agreed upon retirement age, which means that he both gets his salary and their pension at the same time, then he is in fact stealing money from the collective.
It's a selfish act that destroys the pilot group's ability to sustain a decent pension system.