Hamas sometimes can't see the forest for the trees. Sometimes restraint is in your best interest, not action. Nasrallah is showing that he has a pretty good command of the geopolitics of the situation in the Middle East. Of course now Al Qaeda will slam Hezbollah for "protecting the Zionists".
Dozens protest in Shfaram against budget cuts targeting Christian schools (Haaretz)
from the article: Nasrallah: Hezbollah will respond if Israel attacks Lebanon's army