Here is an insightful, well-written defense of Israel's military campaign against Hamas.
The piece, by Robert J. Lieber, appeared in The Washington Post on January 1st, before Israel's ground assault began.
Lieber is a professor of government and international affairs at Georgetown University.
http://www.washingtonpost.com/wp-dyn/content/article/2008/12/31/AR2008123102773_pf.html