Despite the risks and the fearsome feelings towards performing an act, there is still an intention to execute and carry out an act. That is courage. It is such a commendable virtue because you cannot manifest any other virtue without courage, as it makes other virtues possible as said by Aristotle. It is not just found in defensive interactions but also helps build onto one's character, primarily morally. You're probably courageous right now, "but how?" you may ask. Well you're living right now, aren't you?