Having a credible deterrence against Korea's missiles is a good thing.
Fake it 'til you make it!
Yes, AND if you don’t have a credible defense: maintain deterrence with credible offense, i.e. YUGE nukes and the willingness to use them. That seems to be working.
I worked for a couple years at the AEGIS CSEDS outside of Philadelphia in the 80’s. The article suggests a 81% kill probability based upon prior testing. It is extremely unlikely a single missile would be tasked with destroying an incoming nuclear ballistic missile. Even with the occasionally miss “if it flies it dies” with AEGIS.
Re,#3;
Considering how infiltrated we are by by those who sympathize with our enemies it’s a wonder they don’t build our stuff before we do. Unless it’s because they want us to pay for their R&D.