The so-called principles and morals are essentially conditional tools, not absolute unchanging things. When people face "those without needs," they use principles to draw boundaries; but once a strong need for a person or thing arises, they are willing to break principles and pay the price for it. The relationship between people is fundamentally about needs and exchanges: first judging what they want, then assessing what cost they need to pay, and finally making a choice. The so-called "caring" is not just emotion or morality, but the strength of the need; whether one can break principles depends on whether the need is worth bearing the corresponding cost.