Territory conquered in a defensive measure is not a valid reason, even though they think it is. The occupation of Lebanon was defensive, and the capture of territory in 1967 was defensive. But I guess you've "forgotten". Israel has NEVER gone into foreign territory to capture it for non-defensive purposes. You make assasinations of terrorist leaders sound like assasinations of heads of states. The Palestinian Speaker is from Hamas, a terrorist organization responsible for many innocent Israelis' deaths.
Justice Ministry: Information examined by AG about Gal Hirsch didn't come from police (Haaretz)
from the article: Cabinet to meet over expansion of ground operations