I am having a hard time understanding why rule 3 is such a sticking point. Nothing in how rule 3 is phrased indicates or suggests that you are absolutely obligated at any point to shoot someone.
As a matter of fact, pulling your firearm out during a SD situation at all is in and of itself an indicator of intent to shoot. Even if you specifically are not intending to pull the trigger, by brandishing a firearm in the hopes of protecting your life you are saying, quite literally "Leave me alone or I will kill you".
On a broader scale, there is nothing internet warrior or mall ninjaish at all about saying that if you pull your gun, you intend to shoot. I have zero desire to ever shoot another person. I have been in combat, and it sucks massively. I don't want to fight, I don't want to get hurt, I don't want to hurt anyone. That is a 100% true statement. Another 100% true statement is that if I run out of options, I will punch, slash, batter, mutilate, kick, stab, bite, headbutt, elbow, whack, shoot, club, lacerate and puncture a fellow human being to protect my own life. There is nothing wrong with thinking that way, and in fact, I would say that if you truly don't have it in you to fight and possibly kill to defend your own life, you have no business carrying a gun, and I mean that.