things technically inept computer users are paranoid about: -Ruining information about YOU
There are too many people in the world for hackers to break in and trash everyones computers. Even if a hacker did break into my computer I have everything backed up and it would only take me an evening to format and reinstall everything in running order. The only reason my my installations have become "ruined" is because of viruses caused by a certain OS having monopolistic dominance. Since Im in the process of switching to Linux that is no longer an issue.