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I really think that China or Russia,, should they ever consider a nuclear war, will not waste sending over just 20 or 30 ICBMs in this stupid “first strike,, second strike” scenario. I think they will go for broke, lobbing them by the hundreds or thousands hour after hour, and we need to have defenses to prepare for that. Why has this possibility never been talked about? Most likely, as well, they have far more missiles than we even think.

Not necessarily so... one of the 'unknowables' in a nuclear war is called 'fratricide' -- or the tendency of the first nuclear detonation to disable warheads coming in close behind. There's know way to know for sure if a mass first-strike would be as effective as a smaller strike (or a series of smaller attacks).

Then you have to consider the effects of fallout. A larger strike will have considerably greater blowback on the attacker.

Bottom line: an all-out strike is usually a final (retaliatory) action.

Bottom line: an all-out strike is usually a final (retaliatory) action. Usually??? We are talking about something that has never happened yet. So,, we really have no idea what an all out nuclear war would become. Only that it would be very , very bad. We need a defense that will allow us plenty of time to retaliate. With margins of error in minutes,, we should have as much defense as possible.