Satellite killing: the "cost" part of "cost-benefit"

The preceding post suggested that cost-benefit analysis revealed a significant positive "benefit" to shooting down the satellite.

This conclusion was based on the observation that some of the obvious costs were large.

Some of these costs are now making the news (yes, I'm psychic):

Space Arms Race Heats Up Overnight
Jeremy Hsu
Jeanna Bryner
SPACE.com
21 Feb 2008
The U.S. Navy's successful missile hit and apparent destruction of a defunct spy satellite represents a major step forward in the space arms race in the eyes of some analysts. Others are not so sure.

Again, I'd really like to see the real reason we opted to shoot the thing down!