Israel occupied Lebanon for a long time. If not for Hizbollah the IDF would still be there, guarding settlements. Israel still occupies part of Lebanon (Shaaba farms). Hizbollah has proven to be the most effective force to fight the IDF. It makes sense for Hizbollah to keep alert and keep their powder dry. Israelis are itching for a rematch and everybody knows it.
Knesset approves 2015-16 state budget in first reading (Haaretz)
from the article: Withdrawal: Right for the wrong reasons?