>How this was not made a priority zero, drop-everything-and-fix-this-crap-yesterday internally is beyond my comprehension.
Its simple. Minority concerns like this don't upset enough of their users to impact their bottom line in any meaningful way so they don't do anything about it.
Class action lawsuit anyone? That'll bump it up the priority list.
The more this becomes public the more likely it is that stories will surface about how "my life was destroyed because FB didn't actually delete the photo and now I need to be compensated" and there will be a whole bunch of lawyers waiting in the wings to take up their case. They may wait until the IPO has been completed...!
Its simple. Minority concerns like this don't upset enough of their users to impact their bottom line in any meaningful way so they don't do anything about it.