Anyone who makes a creative contribution has to be a narcissist in some sense. You have to be willing to believe that your productions, your visions, are more important than anybody else's, or anybody else. Otherwise, you spend your life serving other people's needs, and none of your visions get realized. Is it possible to be a good husband, father, neighbor etc. and still make great contributions to science, art etc.? Only if you were born with the privileges to give you the extra time, or the connections that make it possible for you to be paid for fulfilling your visions. Otherwise you're going to have to short-circuit your obligations to other people to some degree, and it's a lot easier to do that if you're a bit of a bastard. Many underprivileged people have succeeded in realizing their visions, but rest assured the people who are closest to them will always have at least some stories about how the creators short changed those nearest and dearest to them in some way.