Duty and sacrifice is EXACTLY what destroyed and killed Naerys and Rhaella. Why are the oppressed always the ones asked to be silent and pliant and do their duty regardless of their oppression and abuse ??
Naerys was pious and performed her wifely duties, her marriage to her brother Aegon IV was a very unhappy one, she wished to stop sharing his bed after their son's birth, as any further pregnancies could endanger her life, but he refused out of spite (marital rape). He cheat on her with a LOT OF women, openly humiliated her, sired bastards and legitimized them, threatening Naerys's son claim (and future reign). She finally died in childbirth after a lifetime of misery and suffering.
Rhaella was in love with a landed knight, but give up on him, obeyed her father, did her duty and married her brother. And how did that work out for her ?? Aerys didn't wanted her, openly cheat on her with her handmaids, became insane, and beat and raped her every night to the point where it looked as though she had been savaged by an animal. She suffered miscarriages and many of her babies were stillborn or died in the cradle. She gave birth to Rhaegar when she was 13 or 14. She eventually died in chilbirth after having witnessed the fall of her house and the deaths of her eldest son and her grandchildren, and left her two surviving children (an eight-year-old child and a newborn baby) to the mercy of a cruel and unforgiving world.
And despite being dutiful and faithful wives, Aegon and Aerys STILL accused them of adultery. Aegon openly doubted Daeron's paternity and favored his bastard son Daemon over him. Aerys became convinced all the miscarriages and stillbirths Rhaella suffered was because she was cheating on him because “the gods would not suffer a bastard to sit on the Iron Throne”, forbade her to leave the confines of Maegor’s Holdfast and ordered two Septas in her room at all times to make sure Rhaella wasn't seeing other men.