It is indeed ridiculous that Lebanon didn’t join the ICC, one has to imagine that Hezbollah played a role in that decision. Which is funny because all the Palestinian resistance factions actually pushed for ICC jurisdiction to the extent that they called for it to apply to them and Israel equally! The hoops the Palestinians had to jump through to join the ICC were crazy, including (reified) threats of heavy punishments from the US if they did.
Actually, most reports are that the US is the one that pressured Lebanon not to join the ICC, to prevent the ICC from having jursidiction over warcrimes the IDF comits in Lebanon/
You think Hezbollah would care about ICC consequences? They've been violating the UN resolution calling for them to withdraw north, disarm, and stop attacking Israel for years. Their stated (short term) goal is to disallow anyone in northern Israel to live in peace. (Their long term goal of course is to destroy Israel completely.)
It is too bad Lebanon didn't ratify the ICC treaty. They really should have.