Those who knows no fear are destined to extinct.

Fear is the only force which encouraged survival. Without fear, one will not learn to evolve. This is how things have always been in the universe for billions of years. Although you may not like living in fear, but the fact is, it is the only thing that is keeping you alive at this moment.

Those who say they fear nothing are lying to themselves. Because the world around them would have eliminate them long time ago if they fear nothing. Just like a fire will turn any animals to ash if they didn't stand in its way.

Species no matter how advance, have fear. That is what make them stronger, mentally and physically.