Well put it this way, if you bought 5000 Defective Samsung Screens and when you sell them the majority of people don't notice that there is anything wrong with them, would you make more money selling them or throwing them out?
Apple CANNOT acknowledge that the problem exist. If they do, they will face a serious loss as they would have to have all of their laptops recalled/replaced which would cost a lot of money. It is better for them to just keep quiet and have the people who do notice the problem return their products and only replace those few ones as opposed to all of them.
I am certainly not educated in corporate business matters, but would Apple really lose money in the long run? It seems to be that the manufacturers of the faulty displays would and should ultimately be held accountable for the displays. Maybe I am just being naive and this is not the way the business world works.