Do you feel this way about every ally the US has, or have you singled out Israel for special consideration?
In what sense is Israel an ally ?
Do you think their state sponsored espionage against the US is the act of an ally ?
Why is Israel attacking the USS Liberty the act of an ally while Al Queda attacking USS Cole the act of an enemy ?
Israel is a dependent state of the US - not an ally. They are historically the largest recipient of US aid and currently receive ~$3Bln/yr. They have a per capita GDP near $30k USD - very close to Italy and a notch ahead of Spain. They don't deserve our aid.
The fact is that the Brits and French empires largely controlled the middle east and they drew-up bogus borders and (w/ the UN) and created nascent fiascos like Iraq and Israel. Why are we propping up the results of this process ?
I think Israel as a state has as much "legitimacy" as many other states. Moreso if we consider the UN charter, the ascendancy of the current government, etc. That's not the issue. But the fact is that their existence creates massive antipathy and problems in the region. That Israeli's or Jews deserve a homeland is apparently to rectify a 17 century old aggression by the Roman empire. Well if we are going there then we should certainly redress the Caesar's incursion into England, and the injustices and invasions of the Huns and Mongols.. It get's pretty silly after a few centuries. So it does look a lot like a European/Asian settlement in the ME to the locals - legitimately so.
If the goal was to create a sustainable place for a group that wants independence - then buying up comparable sized bits of Wyoming, Brazil, or NSW would seem a simple solution. No major conflicts, and rather minor impositions by the state. But of course they want to assert some ancient religious claim to the specific place - a place they largely didn't control not greatly inhabit for 17 centuries.
If anyone - Christian or Jew or anyone else want's to support the existence of Israel with their money - that's their business. If they want to involve the US - then I have a big problem with that. Why is it in our national interest to feed a problem ?
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I do not hold that the alleged "special relationship" claim in re US and Israel can or should hold the same policy weight as the Special Relationship (first alluded to IIRC by Churchill) between the US and the UK, by at least an order of magnitude.
But there is a mutual interest aspect to US relationships with UK, Canada, Australia, France, Spain and many others. We have similar and workable views on many of issues. We have complementary resources to bring to bear on issues. I don't see any US national interest in Israel. Supporting "the only democracy in the ME" is a bit like supporting the only skunk at the garden party - just causes troubles.