I do think, when one is a patient, or by extension, a relative, it is hard to speak out.
1. When one is in an angry or disturbed state of mind, one cannot, physically, think straight.
2. Very often one is not believed.
3. Going back over things, actually causes MORE pain.
My son doesn't seem to want to complain, although I feel he has been quite unfairly treated, I guess the above, or something like that, is the reason.