I once heard someone say admiringly of another: "He was very courageous; he didn't know the meaning of fear." While I appreciate this sentiment I've come to the conclusion that this is not really a very good definition of true courage, for it seems to me that an action can only be brave in the presence of fear. People are most courageous when they are willing to face their greatest fears. Notice that the key phrase is "willing to", not "wanting to"! As has often been noted, the willingness to engage in behavior you don't want to do is the pathway to the greatest personal growth.
Many unhealthy behaviors occur when people actually should be fearful but aren't due to some impairment of perception or judgment. A person driving during a thunderstorm should 'fear' the poor visibility and slick roads enough to slow down; a diabetic should 'fear' the consequences of a dozen Krispy Kremes enough to not eat them; an addict should surely feel fear entering a stranger's house for drugs or sex (although paradoxically the inherent risk of an action can intensify the thrill of doing it). Unprincipled behavior that ignores potentially devastating consequences is not courageous -- it's reckless. Refusing to acknowledge and respect evidence of danger can be the last thing a person does.....ever!