It does no good to fight if you have no realistic way to win. They didn’t have the resources to challenge Israel before the war with Iran started and now they’re in an even worse position. They have two roles - as an irregular branch of Iran’s military and as a power within Lebanon, and they’ve chosen to prioritize the former and fight a losing battle at the expense of the latter (and at the expense of Lebanese people with no particular sympathy for Iran who don’t want to be involved in this).
It does no good to fight if you have no realistic way to win. They didn’t have the resources to challenge Israel before the war with Iran started and now they’re in an even worse position. They have two roles - as an irregular branch of Iran’s military and as a power within Lebanon, and they’ve chosen to prioritize the former and fight a losing battle at the expense of the latter (and at the expense of Lebanese people with no particular sympathy for Iran who don’t want to be involved in this).