I just used them. Sooner or later viruses take their toll, even if you have virus protection they still find a way in to your computer in the end <_<
Viruses don't damage hardware, only software - and even in a worst case scenario reinstalling your OS will completely eradicate any viruses. And no, they won't "sooner or later", I haven't had a virus in... oh, probably 5 or 6 years, simply by using common sense(!)
Yes, with stupidity you can damage a PC, wheras it's much harder to damage a console - why is not promoting ignorance a bad thing?
I haven't had a computer failure for probably about 12 years, now, I still have a 6 year old PC that's functioning perfectly fine, and I don't know anybody who hasn't had their xbox fail on them at least once, and while the newer models are better, the older model's failure rate was rediculously high. Consoles use the cheapest parts they can find, wheras you can buy some decent bits for your PC that won't fail at the drop of a hat.