In my case I do have quite sensitive data stored. If all you have on your machine is a few mp3s then neither do I see need in security. But even then many would like to have some privacy right?
I've actually driven around the city myself and I'll tell you what, over 50% ov all networks I found were totally exposed, you could see the computers on their network, you could go online via their cable modems and so on. Now imagine that an evil person like me would hack some box using your connection, you know who would get crap for that? Not me, you, since it's your IP that is stored in all logs.
that's just my point, I do care about my security.
/ filipp