Who cares? Beggars don't get to be choosers. The social landscape of the USA has had a lot of shifts over time but in parallel to this is our military apparatus which has operated with a long running philosophy of self sufficiency and pre-emptive readiness. If Israel won't play ball we'll go elsewhere or roll our own, if anything this makes them less valuable since their biggest contribution is as a test bed and not sharing source code might indicate a desire to shop the product around.