Antonyms for "made vulnerable" would include "protected," "secured," "sheltered," and "shielded." These words connote the idea of safety and security, ultimately suggesting that one is not exposed or at risk of harm. To be protected, for example, is to be shielded from danger, whether it be physical, emotional, or otherwise. Similarly, to be secured generally implies that precautions have been taken to prevent harm or danger. And to be sheltered suggests that one is being cared for, perhaps even nurtured, in a manner that ensures their wellbeing. In essence, these antonyms for "made vulnerable" all communicate the idea of safety and protection, creating a sense of security and peace of mind.