Iron Dome was never invented to shoot down ICBMs and it has no chance against Hypersonic missiles. It gets even more difficult now that Hypersonic missiles exist. Hypersonic missiles have a much shallower trajectory. The best time to intercept an ICBM is immediately after launch or as it is on final descent. ICBMs have counter measures and also dummy warheads so all warheads need targeting and destroying. Anyway your main point stands if there was technology to eliminate ICBMs USA. UK and Europe would have ended this war already.