It is a dumb idea.

BUT.

The people saying that it is difficult or impossible because of "PhYsIcS" are operating on information that was true when they were young researchers/students studying the state of the art at that time.

Now they are old, and things have changed.

Targets approaching a modern ABM platform at 2-7km/s can be engaged with a very high chance of success. It's not even that expensive. The Patriots in Ukraine can do it.

This isn't my opinion it is fact. There are photographs of the shattered remains of Russian MRBMs with approach velocities of 6km/s littering the Ukranian countryside.

It would take additional research and development to move 10km/s intercepts from "experimental but possible" to "very high probability" bin. R&D that is expensive, but not impossible.

I say 10km/s because russia is targeting 10km/s for all of their new wonder weapons. They are targeting 10km/s because they, like I, know that practically anything <10km/s is "doable".

It is not the 90s anymore.