I feel there are many reasons to support Israel, from its human rights record, to the fact that it is the only non-racist, non-apartheid state in the Middle East, the list goes on and on.
But one of these reasons is very simple. Israel is the canary in the cole mine. Israel is the front line in the war the West is fighting with Islamic extremists. There are some people, who are either misinformed, leftists or both, that believe that groups such as Hamas and Hezbollah only hate Israel and would sit around and be good citizens if God forbid, Israel fell. This is the furthest thing from the truth. Our enemies, would be emboldened and they would start on their next target, which would probably be Europe. From there, they would seek to force the world to become Islamic. There is no appeasing these people. Their goal is an Islamic caliphate. In Islam, the caliphate is a religious and military leader of the Muslim world. Very similar to the pope, but different in that he is not only a religious leader but a military leader as well. This position started with the death of Muhammad and continued up until the early 20th century, when it was abolished and Turkey, the home of the last Caliphate, was declared a secular republic.
Anyway, over 1200 years ago, before the advent of Islam Jews, Christians and Pagans all lived together in what is now known as the Islamic world. Was everything always perfect. No. Absolutely not. There was a lot of fighting, it was the seventh century after all. There were tribes. Some were Jews, some were Christian, some were Pagans. Wars went on between clans, there were alliances, kingdoms rose and fell. However, what we now know as jihad was not a developed concept. In the Middle East, outside of the Christians, there wasn't the heavy (there was some) anti-semtism. Many of the Pagans and Persians were allied with the Jews. Many of the Christians were allied with the Byzantine empire. But every tribe had its own priorities. In fact, one of the kings of Persia was a Jew. One of the kings in what is now Syria was a Jew. While there was fighting between the various tribes, there wasn't this complete, pervasive racism and hatred that we see today against Jews, Christians and other "infidels." Medina was a JEWISH city, before Muslims stole the land. In fact, when Muhammad was persecuted in Mecca, which was a pagan city, Jews were the only people who gave him and the early Muslims shelter.
Anyway, Muhammad came and first fought certain Jewish tribes. And then when these were destroyed or subjugated he moved onto the Christians. These tribes were subjugated by the Muslims and then the other tribes fell. This fall was do to the fact that the other tribes didn't unify, band together and fight the Muslims. Due to their far superior numbers they could have defeated them. Even after the Muslims had conquered the Arabian peninsula, things were still not too late. If the remaining Christians, Jews, Zoroastrians, Hindus and Pagans had joined together, they could have handled the problem. But everyone thought, well they are just angry with the Jews and some Christians. Who cares. The problem has nothing to do with us. In fact we have a shiny peace agreement with them. Which, in the end ended up being worthless. Absolutely worthless. The Prophet of Islam, Muhammad, spoke positively of Africans and then his followers when into Africa and killed over 100 million defenseless Africans, not to mention the hundreds of millions of Hindus, Jews, Pagans and Christians that were killed in cold blood by these people. None of these groups thought to unite. I can imagine, they probably thought, "the Jews deserve their fate." We aren't Jews so we don't have to worry about what they are doing or something similar.We can't bring the hundreds of millions of innocents that were killed at the hands of Muslim jihadists back, but what we can do, is learn from the mistakes of the past.
And, like many things, the instigator started with the Jews. What starts with the Jews NEVER ends with the Jews. So, the failure of some Christian, Jewish and Pagan tribes to join against the Muslims and destroy them, which they could have done so as their numbers were far greater than the early Muslims, resulted in hundreds of millions being slaughtered.
Does this mean every Muslim is bad. No, absolutely not. It means that certain Muslims, the ones that carried out these acts are bad however.
Today, we have a repeat of this situation. We have extremists, terrorists, racists, who say they want to "wipe Israel off the map." However, due to the enormous advances in technology between the seventh century and today, it would not take over a thousand years to kill hundreds of millions of innocents. It would only take a few well placed nuclear blasts. Blasts which the perpetrators believe will ensure them a place in heaven, which is the thread which links the earliest jihadists to the present day ones. In the seventh century, the goal was a global caliphate and today, the Islamic jihadists have as their goal, a global caliphate. In other words, the entire world living under Islamic, called Shariah, law, subject to the whims of the Caliphate. So while in the past we didn't unite to defeat the evil which eventually cost the lives of so many of our brothers in sisters, today we must unite and defeat this evil and the extremist ideology that spawned it once and forever.