I'm not criticizing anyone for accepting the PERS that was offered to them in the past but I do believe the payout formula was much more generous than expected, and perhaps by the design of those who wrote and benefited from the formula. Specifically I recall in the late '90s when a number of great teachers retired early because the market gains locked in a benefit higher than their salary - it was take it or lose it if I'm correct. So a number of people who would have ordinarily worked another 10 years were instead taking their pension 10 years early, and the district then needed to hire to fill those positions with new Tier 1 (future) recipients. 
Most company benefits are designed to incentivize people to work, not quit!  I don't remember anyone held responsible for that miscalculation and if the were they likely sued and were awarded back pay.