Explanation

Casting a blind eye to suffering means that these people ignore or pretend not to see the suffering.

Thus, they are inured to suffering — they are hardened and desensitized as a result of seeing so much of it. Trap answer exempted would mean that the people described are no longer personally subject to the suffering. You don’t know that, of course. You only have the clue that the people cast a blind eye, or ignore suffering. Because they ignore suffering, they also wouldn’t be maudlin or effusive, which are about expressing strong feelings.

Inured to.