All those in enforcement responsibilities must have observed this during investigations. General comment is that, "sorry, I was not there, or, no, I did not see though I was nearby, etc". People should not be afraid. If fear factor is there, then, listening to the requirements even for the safety of the employees or public also will be less.
It is better to have coordial approach with persons as long as they do accept the need for implementation of regulatory requirements. Those who do not listen can be dealt with sternly.