MissAdventure
When you're at a low ebb, the last thing you want to is stir it up more, I think.
Then, when you're out, you don't want to revisit some of the events in your mind.
My ds researches into patient safety. One of the measures they use is letters of complaint. Contrary to what one might think, fewer letters of complaint than other hospitals can be a red flag of things being seriously wrong. It’s exactly what you have said in your post - basically, people treated in a ‘troubled’ hospital are so relieved to get home alive that they don’t complain, they are just thankful they escaped.
Letters of complaint about the food and other smaller matters are generally an indication that the hospital is running well, because if that’s all people complain about, it means there aren’t bigger issues at play.
Human behaviour is very interesting.