"Why would anyone be interested in what is in my PC?"
Because software can shuffle through a whole mass of details from a huge mass of computers quite effortlessly, mining details such as credit card numbers for example. Do you use on-line banking? Perhaps not, but lots of other people do and software can crack the passwords easily. Professional Pilots are notoriously wealthy people so pilots computers might be very interesting places to visit. If you want to open up your PC like a whore's legs to all comers, just log on to an Internet Chat session. Hackers are very interested in IRC numbers so they can track log-ons and walk straight through the open door into your files, even if you have a firewall. Get real, there's lots of stuff in your PC to attract attention. You wouldn't leave your briefcase on the front seat of your car, now would you?
Or would you?
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Through difficulties to the cinema