Because there is no protection for the individual who reports an issue of an aircraft that has a problem being released for flight, let's say, an aircraft that should not be released but is released under pressure from the employer. The individuals are afraid that they will be sent home without pay or treated in a different fashion, or that they will be disciplined. This is and has been different in different companies, in different areas of Canada.
If I tell you that I know this aircraft left and wasn't fixed, and I put my name to it, what's going to happen to me? Now, if I submit a report and don't tell you who I am, then it can't be followed up by anybody to find out if what I've said was true and accurate and if it in fact has been corrected prior to the aircraft departing.
Those are all issues--as even Transport Canada will tell you--that centre around a safety management system. In SMS and under the Canadian air regulations, you can only report something I did and get immunity. If I blow the whistle on somebody else, while they may not punish me today, I might walk around in the hangar with a little target on my back for the rest of my career at that company.