Many hackers as well do what they do out of enjoyment. Too, many of the network security and monitoring tools widely used today were designed be hackers from the methodologies used to gain access to systems. Hacking is also partly responsible for the progression of security software. Even if all reasons for needing protection went away, the peace of mind afforded by having security means is irreplaceable. Knowing that the locks on your doors keep you relatively protected against break-ins comforting even while being perfectly aware that this does not guarantee your home will not be broken into.
Security software serves the same function.