This is exactly what Golden Dome proposes to do for missile defense. It improves the math of missile defense a lot compared to past proposals and it’s not completely crazy but it’s still not certain if the technical capabilities would be there even with a fully operational Starship.
these videos are saying Golden Dome (or at least missile defense) is currently not good enough
the one above and this one https://www.youtube.com/watch?v=KdPTpRfhdWM
which you know credibility who knows
edit: the "not good enough" part I mean kill vehicle trying to lock onto the right target not decoys
but I've only started looking into this, not that I really have a say in it as a civilian just along for the ride