We have 4 layers of ICBM defense. AEGIS should have a decent intercept rate. Sure you can overwhelm it, but it should shoot down a quite a few missiles. A masters degree doesn't mean you've kept your info updated, it just means at one point in your life you got a degree and at face value you're just some rando on the internet making claims without providing proof.
https://www.mwrf.com/markets/defense/article/21848658/the-3-major-phases-of-effective-missile-defense-systems