"Israel has jets, artillery, tanks, and a navy. Why would you begrudge their opponents the use of missiles?"

The Israelis have the weaponry they do for good reason: survival. And no one 'begrudges' Hezbollah the rockets. They have 'em and the Israelis are doing what is in their power to ensure that those rockets are NOT used againt Israeli citizens. They are going to do everything they can to destroy the Hezbollah leadership and materiel before the cease fire is brought about. Period.