I wouldn't put too much stock in that. Unless it was something really horrific, folks tend to remember the good times and forget the bad.
A second point to consider is that many of those former slaves just didn't understand the situation they were once in. They took as reasonable something that most assuredly was not.
This is what I try to get across to my students. These people were born into slavery, as were their parents, grandparents, etc. They had no other frame of reference, so many of them never even thought of trying to escape because they had no clue how to live without an overseer. It doesn’t make it right. It is just how things were.