We can. It’s just very difficult, and unreliable. And even though missile defense sounds like an innocent, altruistic military policy, (“we’re just trying to defend ourselves!”) it’s frowned upon by other nuclear world powers because it makes them think we’ll be tempted to launch a pre-emptive strike and attempt to defend against a retaliatory strike.
And it’s really expensive. Installing enough missile defense systems to secure the continental U.S. would cost a ridiculously impossible large sum of money, and would not even guarantee protection from a nuclear strike.
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