No, I don't think your thinking is irrational. I thought the statement about "stand-on" and collision avoidance is contradictory. Of course, when "stand-on", a predictable, steady course, is going to lead to collision, the necessary action is to avoid collision no matter what, and Rules 4 through 19 provide for this. That is rational. The problem is that it isn't always possible to avoid getting hit. I think the single provision (f) (iii), which isn't even necessary, only serves one purpose, and that is to cast doubt on the victim of the accident.@Scott T-Bird At that point, had he sounded a horn to no affect, it would have been clear that collision avoidance trumped stand-on status. My thinking is not irrational, at all.
All that 8(f)(iii) states is that if you are a stand on vessel you are still obliged to follow rules 4 through 19 if a there's an impending collision. So, you can be at least partially responsible if you fail to mitigate the situation when you could have.
Tell me, if it is a fundamental principle of common law, that both parties must take whatever action is possible to mitigate damages or injury. which I agree it is, why do you think Rule 8, (f) (iii) is a necessary clause? What purpose does it serve?