Because the value of the defence is that it makes attack harder. Not impossible - harder - so it takes more effort for the attacker to be sure of the same outcome. And that effort comes out of the attacker's ability to hit multiple targets.
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Of course, if you use nuclear warheads on your ABMs, it's very easy! But even if you don't - well, if you have a battery of ABMs around DC, that means more ICBMs aimed at DC *and fewer aimed elsewhere*. That second part is the value of the system.
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