"Hezbollah long ago recognized the value of deterrence. A month after Israel killed Hezbollah leader Sheikh Abbas Mussawi in February 1992, a suicide bomber blew up the Israeli Embassy in Buenos Aires, killing 29 people. While Hezbollah denied responsibility, Israel refrained from assassinating top Hezbollah figures for the next 16 years."
So yeah, Hezbollah needs to respond in order to reestablish its deterrence. But since it is a sub-state actor, among other things, how exactly remains a mystery.
PS-- Question to the readership: Do you think that a Likud led government will adopt preemption with Hezbollah?