[jhofmann]

A small mass driver that can hurl payloads to earth. I'll trade one ICBM for a "small mass driver". Please keep my tax dollars out of your schemes of glory.

[Brett66]

I was talking about China owning the mass driver and your ICBM could be intercepted by a missile defense system. However, a mass hurtling in from space at much higher velocity than an ICBM could not be intercepted by a missile defense system that isn't designed to handle such targets.