You are not a bad Aikidoka Frederick-san. To me a bad Aikido-gakusha is when one pick fights or be in unnecessary fights or even worse, competing in prize fights.
My sensei use the analogy of military training to explain Aikido training: "It is like a soldier training. Everyday the soldier practices tirelessly for skills that the soldier might not be able to use directly after. But when a war or just a battle breaks out, the soldier will use everything that the soldier had learned. The soldier might die in battle, but the soldier has accepted that fact, because the soldier fought for the soldier's beliefs. During the countless training days, the soldier has prepared for death."
What you were saying is not wrong Frederick-san. When one need to defends life, oneself's or another, or one needs to uphold justice and honor, it is justifiable to use one's necessary skills. Just remember one thing, when one is executing techniques during a physical conflict, one must accept that the outcome for oneself is death.
The statement does not mean that one should just give up or be reckless. It means that when one do defend oneself or others, one must do it 100%. Thinking "Could I die or not?", "Could I succeed or not doing this?, or "I don't want to die", will have serious consequences, one might as well walk away or run away.
One's intention must be pure, whatever that intention is. But, if one has doubts, might as well turn the other way. One quote that I modified a bit from my sensei that I like to use from time to time is, "If I have to die by the sword today, then I will do so with honor."