Chang, I did my 69 page masters thesis 5 yrs ago on how to retain RPA pilots. I surveyed about 50 of them. Your data and mine seem to conflict.
Listen Chang, I've never flown an RPA, I love my AF/country, you name it. I would have stayed in without a bonus so listen to someone who is not your bitter dissenter.
I've had buddies go to RPA's who were some of the most upbeat, positive dudes I ever met. They took the assignment and I remember their fini flights...none were USAF RPA haters. One guy was excited.
5 yrs later, 100% of them are out. The stories they told me of shift work, denied career opportunities, horrid family life etc. made me appreciate my 179.
Chang, I urge you and other leaders to get in touch with the "actual" pulse of the USAF. There is a huge disconnect somewhere with what you are seeing vs the reality of things.
Despite your assumption, this forum is a pretty good cross section of what I hear in sq bars across airframes and the USAF from all ranks and backgrounds (no this is not just a pilot problem).