The universal answer as to why (there is no fair, working system implemented) is, as usual, 'cui bono?' Any strategy to make whistleblowing power-balanced is by proxy heavily undermined by all forces that do not want it. Those forces, big corporations and their third-party henchmen, have heavy financial interests to bring down any just way of whistleblowing. They have a lot more money, time, manpower, influence and corrupt people who execute the dirty work.

To have incorruptible lawmakers lay the ground work is only the first step. Then the laws have to pass in their original intention, ie. waterproof wording without loopholes. Any unintentional loopholes have to be identified and fixed. Then the law has to uphold to "accidental" mistakes, misinterpretation and misrepresentation, official or secret changes, additional laws that reverse them, ....