Could shielding a loved one from a terrible truth be admirable? I would thinks so. But much would depend on the stakes, the relationship, and reasonable assumptions about what our beloved would or wouldn’t want to know.
Could abusing entities that don’t really matter be indirectly wrong out of concern for entities that do matter? Kant thought so. While torturing a cat (which lacks the power of autonomy, and therefore substantial moral value) might not be directly wrong on Kantian grounds, it would probably make a person more callous generally, and therefore more likely to harm human beings.
Such are the core issues in cases 3 and 5. But don’t take my or Kant’s word for it. Think them through for yourself! And do it like a pro using Coach Michael Andersen’s expert study guides.