““No one without sociopathic or psychotic tendencies can be glad at the news of another person’s death, but there is a kind of surge of adrenaline and sense of purpose that can be very powerful. It is without doubt a dark and complicated feeling, shared with firemen and soldiers and paramedics and emergency-room workers, that comes from knowing that you can only be at your best and only really achieve any kind of fulfillment when what is at stake is literally life and death.””