Ever take that computer on the Internet?
Seriously, yes I do. The point is I do not keep personal PRIVATE/Confidential data on my computers. That means you can hack my computer all day long, turn it into your personal b*tch all you want --- you won't find a single shred of personal financial, medical, family, etc.. data on it. I keep all that data OFFLINE on removable and encrypted media that requires a key to access it.
With that data all offline and encrypted, I feel much better about my "internet security." It also makes it pointless for someone to hack me. They may get into my computer, they won't however find anything "useful" to them.
BTW: I'm a certified CISSP, Firewall 1/CheckPoint 1 certified IT Professional. So I know a little something about Internet Security and as of last summer, defeating DDOS attacks at a large scale thanks to a bunch of Iranian hackers who couldn't do more than knock on the doors of my employer looking for exploits.
Some may consider my guarding of my personal financial, family, etc.. information a little extreme. I do it because I know what's possible and because I assume I'm not always the smartest guy on the block.