Forget the laundry hamper with shreddable panty hose. Computers are much more attractive. What more could a cat want than floppy disks to trounce, monitors to scratch, mouse pads to claw, and laser printers for yoga or acrobatics practice. And, unlike the common stereo or TV, computers have lots of sensitive electronic components that can be rendered inoperable by a single cat hair. And, unlike rats, squirrels, or gophers, computers don't fight back.
Computers hold other advantages for cats.
Consider the prestige factor. Simply sit in front of one for a long time without moving and people will think you are a very smart dude. Try sitting like that in front of the refrigerator and people will start making jokes about you. Cats adapt naturally to computers. The leap from TV top to computer is an easy one to make.