you want a real korean input? (Score 2, Informative)

I don't know about the japanese or the taiwanese, but from a south korean point of view, the ability to shoot down ICBMs is not worth a single penny to spend on. Currently, there are about 11 thousand cannons (yes cannons, not missiles) pointed at Seoul, the Capital city of Korea. In case of a war breakout, these cannons will completely wipe out Seoul within 15 minutes. Unlike missiles, the cannons can't be stopped. It takes 5 minutes to wipe out the korean army guarding the border, and it will take us 15 minutes to send out bombers to target the cannon sites. So, shooting down ICBMs come into play after my capital's covered in fire, and my people are killed. Only the americans would be excited to have an excuse to attack north korea and use my country as their battle ground. Shooting down ICBMs is really the least of concern. But, I sure do hope you americans have something to shoot down ICBMs with nuclear warheads. Because if those things get launched, they are not landing on us. They are landing on you.