I'll take these moans seriously when you provide meaningful comparisons. So for private sector employees, how are their pensions funded (majority funded by the employer, right?). I contribute towards my bank's income through bank charges, so do I get to moan about my bank's contribution to my bank manager's pension?[I know your answer will say that I can change my bank, but not my public servant - so what? What's the alternative? Do you want no public services?] The balance isn't made up by 'the rest of us'. It is made up by 'all of us' - us public servants pay taxes too.
And when you do your comparison, don't forget to include the many low-level public sector staff who get little benefit from their pension contributions, given that the standard OAP is deducted before the pension is paid.
How many private sector staff don't get increments following a performance review? How many private sector staff will pass pickets etc. Otherwise, this is just a meaningless B&M session.