It is not in any sense a USA-centered opinion. Look at the list of countries and supra-national organizations which have comprehensive sanctions in place against North Korea: which include not only the US, but Japan, the European Union, Australia and Taiwan.
You can adopt whatever degree of moral relativism suits your purpose, but there's basically not a lot of people anywhere in the world who are looking at what's happening in North Korea and saying "looks good to me".
You can adopt whatever degree of moral relativism suits your purpose, but there's basically not a lot of people anywhere in the world who are looking at what's happening in North Korea and saying "looks good to me".