To become an elder you have to be fairly conditioned in the first place. The requirements that you are regular at meetings and taking the lead in field service over a number of years mean that by the time you get it you are so focused on the requirements and the task that you don't raise your head to look at the bigger picture.
The society is also very good at reinforcing the idea that deletion is shameful and humiliating even if you step down for good reasons there is a slightly sordid feel that you have done something wrong.
Some people who realise TTATT feel that they can make a difference and be a mitigating force for good. This is often misguided but a common misconception.
Whatever the reasons everyone makes their own personal journey.