I apologize that I didn't read this entire thread, so some things I say might have been said already.
First off, from much earlier, Obiwan, did you really say that World War II was caused because the Allies were NOT harsh enough on Germany? You have that completely backwards: the Treaty of Versailles gave parts of Germany to other countries, limited the German military, went totally against the idea of popular sovereignty, forced Germany into a huge debt, and even blamed Germany for WWI which it didn't start. That was why Hitler was able to come to power; Germany was ruined. That's also how appeasement started, because France and England realized that the treaty was unfair, and that Germany deserved the territories stolen from it. Clearly, WWII was able to happen because the Allies were too harsh in punishing Germany.
Second, I've seen the argument that Israel deserves the land its on because that's where Jews lived for thousands of years. Right after they stole it from the Palestinians. Even reading the Bible, which would be biased towards the Jews, it is clear that the society depicted in Joshua and Judges is not good in any way, being militaristic, draconian, and genocidal. If anyone deserves the land because they were there first, its the Palestinians, although I personally think that that argument is weak.
Third, Israel has only existed since the end of WWII, when we felt bad for the Jews and decided to steal someone's land for them. If a country thinks that the Jews deserve compensation, give them some land that they own, not steal it.
Fourth, neither side is innocent. Sure, Hamas "started" it by firing rockets into Israel. I don't really think that Hamas started the conflict that has existed for thousands of years, however. Hamas had provocation for attacking Israel, probably claiming that they stole land. Israel had some justification for taking the land, and so on. Looking at this as an isolated event is absurd.
Fifth, the conflict isn't going to end when one side loses. I see three potential outcomes. First, most likely, the conflict won't end in the foreseeable future. Second, which I find very unlikely, nuclear war. Third, which is the solution I prefer, is that the US threatens to withdraw all support from Israel unless they start being sane, unlike any country in the Middle East. By sane I mean that they agree to any ceasefire, only hit military targets, and are open to negotiation. If they refuse, at least they aren't causing us any problems.
And I don't really see what the US has to gain from supporting Israel. Our support for Israel is why so many people hate us in the Middle East, and we don't get anything from it.