Detachment is absence of emotional dependence, not absence of emotion.
Chaitanya Charan Das: Some people fear, “If I become detached, will I become emotionless, uncaring, stone-hearted?”
No, detachment empowers us to care truly for others, for it frees us from emotional dependence on them. When we are emotionally dependent on someone, we make decisions based on considerations of their pleasure, without considering any higher principles or purposes. Being driven by such narrow considerations, we often act against their best interests and even our best interests.