Some believe that fear is necessary. That without fear we'd absentmindedly just walk into traffic or whatnot. But I think we will be safer without fear, not to mention being able to enjoy life a tonne more.
Too much fear is paralysing, the worst thing to be.
And even at a lesser level, fear makes us clumsy. On an expedition, the most dangerous member is the most fearful one.
Without fear we handle any danger quickly, intuitively and smoothly.