Is Israel justified in invading Gaza?

Posted Jan. 05, 2009, at 3:47 p.m.

Palestinians broke a cease fire with Israel in recent weeks by again firing missiles at Israel. Israel responded with far deadlier missiles, and is now invading the small Palestinian territory. Is Israel justified in its military actions? Or does is the response disproportionate to the threat it faces? Strategically, is the invasion good or bad for Israel

in the long term?