It is often assumed that democracies should be judged differently in their external actions than non-democracies, but I have yet to see an actual argument why that is so.
The Persian Wars don't help -- frankly, I don’t think "fear society" and "free society" is a useful division in antiquity (the Hebrew Scriptures seem pretty clear that the Persians were a lot better than the Greeks in respecting Jewish religious liberties), but what could be more of a "fear society" than Sparta? Sparta and Athens ally against the Persians basically out of the same motivation that the Sunni Muslim Brotherhood and liberal Arabs have for cheering Hezbollah -- ethnic solidarity against a foreigner they perceive as bent on ruling over them.
Thucydides is pretty darn clear that Athens, however internally democratic, was brutal with its allies. The Melian Dialogue in Book 5 of the Peloponnesian War, however unlikely as a record of actual speeches, shows what Athens was capable of.
In more modern times, there have been plenty of peoples who are internally liberal, but brutal -- even genocidal -- to those they exploit. Belgium in the Congo, the British in Tasmania or Ireland, America in the Philippines.
It is a huge mistake to interpret a fundamentally ethnic conflict about land -- blood and soil -- as an ideological conflict about systems of government. Israel, sensibly enough, does not want to see a democracy in Jordan or Egypt. A more democratic Turkey has been a huge complication in its relations with its former close ally, as of course was the overthrow of the Shah. And I believe there was a relatively free election in the Occupied Territories recently -- does anyone remember what happened there?
Anyway, Lebanon is a democratic -- if disordered -- state. The IDF is flattening whole villages, destroying civilian infrastructure well outside territory controlled by Hezbollah, and basically treating the Lebanese population as a whole as enemies, as the reaction of traditionally pro-Israel Maronites shows.