A PC, like a performance automobile, requires a certain level of user involvement to keep it working. You need to maintain it, make sure things are updated, and tune things to keep them working. You have to know enough not to try to download strange programs, keep defensive programs up to par, and many other things. None of these things are very hard, but they need to be done, and done reliably.

Someone who doesn't do these things will not keep a PC running long. A Mac is not invulnerable to computer ignorance--no computer is--but it's more forgiving of the kind of person who sees a computer as an appliance, along the lines of a coffeemaker. I used to have to delete strange .exe files that my kids used to download and try to install on their machines. If they'd had PCs...ouch.

This is not a judgment on either side. I need the horsepower and compatibility with heavy-duty software that a PC can give me. You will not find Solidworks, Autodesk products, or many other things running on a Mac. Even a recent Mac. On the other hand, my family needs computers that Just Work, and run the basic software they use.