Absolutely opposite actually, I have no damn clue what average North-Koreans think about their country and its political leadership. I could make some guesses but it is also highly probable that I would be completely wrong. You on other hand made a sweeping statement: "By and large, the people of North Korea are both happy and proud of their nation" That is no different from people who think that Norkies must absolutely despise their government. Both are just assumptions based on extremely limited information.
Do not forget that there are happy and unhappy citizens everywhere, some people have decent lifes while others suffer. One should not draw conclusions made on assumptions and generalizations. How many people are there in prison in the US? How many are dissatisfied with their government? how many riots? How many social problems?
One could claim that the US is a hellhole full of poor people with drug problems, insufficient healthcare, incredible oppression by state authorities and that the population would welcome the toppling of the regime. Especially the hundreds of thousands of prisoners - not to mention executions.
At the same time, many foreign travellers only visit the top sights and noone dares to walk around the slums.
Many Americans cannot afford to travel, though they are "free" do to so. That does not make America a hellhole of its own - it always depends on who you are in each country and on countless other factors.
Numbers count, too. Happy and wealthy people also exist in Somalia and Afghanistan, impoverished homeless drugaddicts can be found in Austria as well. That does not make Somalia a great place to live and Austria a hellhole.
Political bias is also a factor - I guess social conditions in many countries are much worse than in the DPRK - even without a trade embargo - but I haven't seen many stories of 'President of X-country feeding his minister to 120 dogs and executing his uncle with AA guns" being made up for their respective leaders.