I think the concept was to totally destroy Hizbullah's military wing on the battlefield, kill off the fighters and battlefield leadership, and essentially leave Nasrallah with nothing but politics as an option in the ongoing struggle in Lebanon. The Israelis are smart enough to know that killing Nasrallah, as charismatic as he is, or other Hizbullah senior leadership would not destroy Hizbullah as a movement because it has achieved the level of a genuine social movement/party within the Lebanese context as the overall representative of the Shi'i, especially the pious middle and lower classes.