Co-sign and an excellent point. It is one person against an entire world of people. People who are capable of anything and people who eventually one of them will be smarter/skilled than you are. Thus, that one person has more to bare with and deal with. Excellent point, crashburn181.
Defence takes more skill.. I takes more knowlage and power to protect something. Weather it be a network or a single computer. Your one person agaist the world. Even the best defenders can be beat by crackers. Securing a system takes not only talent it also takes a bit of artistry..