Thanks #51 wholeheartedly agree.
Of course paperwork is one of the many tools (but not only) available to us as aviators.
Of course situational awareness is vital, but even in a perfect world there can be confounding factors (distractions, fatigue, empty field myopia, over-transmissions (busy CTAF), non-transmission (button pressed but nothing goes out), looking but not seeing, listening but not hearing, internal and external pressure (real and/or perceived), and so on).
No matter how many hours in command, or level of skill, or diligence, by definition, human factors are so important and not to be discounted, and actually do a pretty good job given the complex tasks expected of us all.