If you went to a friend's house to play console games with them, & you threw the controller against the wall & broke it, would you be surprised if your friend was mad & demanded you pay to replace it, or simply banned you from playing on *his* game system in the future?

That's the situation here. *You* didn't buy your corporate-issued desktop/laptop; the corporation did. *You* aren't paying for the access to the Internet for your corporate PC; the corporation is. *You* aren't the one that has to pay a tech to fix the PC because you tried to install a bunch of spam-ridden software, or wanted to send out gifts to your "friends" in Farmville & screwed up the system; the corporation has to.

What you do with *your* equipment at home is your own business; what you do with the *corporation's* equipment -- especially when they're paying you to work -- is the corporation's business. Don't like the rules? Quit your job...& good luck getting those unemployment benefits (hint: quitting your job usually means you won't get any).