North Korea's thinly disguised missile test violates U.N. resolutions and should be condemned. But it is not a serious threat to the United States, nor does it justify a crash program to deploy an expensive, unproven anti-missile system.
Links
[1] https://ploughshares.org/file/554
[2] http://www.ploughshares.org/news-analysis/blog/north-korean-launch-not-cause-panic