I think the reason these precepts are sustained across generations of culture and, indeed, civilization, is because they're based around a fundamental truth - n

I think the reason these precepts are sustained across generations of culture and, indeed, civilization, is because they're based around a fundamental truth - namely, that of survival, and are therefore a 'survival-decision factor' in the telling/usefulness. But it turns out that its one of those factors which, socially applied, radically increases the survival potential of the group - not just the individual. This precept can be applied individually, but is most useful socially. By way of example, in the case of the person whom you would characterize as not having fulfilled the principles, while claiming to do so - you are also manifesting that circumstance. By observing her doing this, and deciding not to apply the principles, didn't you fail to seek truth, be kind, seek to improve the situation, also? That is the crux of these -ism's. They only work if you want them to, because they are driven by willpower and little else, yet they align with the fundamental principle of life, the desire to survive. Truthfulness, kindness and tact are contributing factors to a functional society.