Fairness of the solidarity deposit for “soon to retire”

I'm currently listening to a few podcasts in which the new pension reform regulations are discussed. The regulations regarding the 2% for the retirement savings account were also discussed several times. It was said in EVERY post that it was entirely fair for soon-to-be-retired people who no longer pay in (much) that fictitious payment periods can be financed through tax revenue. So a depot for free, without risk, essentially free money. What's fair about that? Can anyone give me this thought