The silo parks in USA are still nuke-proof. Because they are far enough apart that you can't get more than one per hit, and it has to be a low or groundburst, b

The silo parks in USA are still nuke-proof. Because they are far enough apart that you can't get more than one per hit, and it has to be a low or groundburst, but close enough together that the first hit causes a cloud of dust that the subsequent missiles would have to go through to hit their targets. And a nuclear warhead in re-entry has no chance of surviving hitting that dust cloud. This means that the silos are protecting each other -- you'd need to wait hours between hits to be able to land nukes on all of them. (Or hit them all within the minute.)