Another way of looking at it is that reducing tensions will mean there will not be another unnecessary war which has the potential to go nuclear and kill millions; not only in the Korean peninsular but elsewhere as well.Reducing tensions with N.Korea will mean they can continue funding their research and conducting tests until they declare they have the capability to strike the major US cities.
It's not as if the North Korean leadership is going to wake up one fine morning and decide out of the blue to launch a nuke at the U.S; especially given that their aim is regime survival and they're fully aware that any use of nukes will result in the destruction of North Korea. Like everyone else; their nukes are intended to be used as a deterrent - in their case a deterrent against regime change. North Korea having nukes is not the best or ideal of situations but the fact remains that military means alone can't resolve the issue.North Korea will be untouchable militarily and no matter what military coups or revolutions take place in that desperate country's embargo future, there is no way to control who's finger will be on the red button.
On another note this might be a book worth reading.
[Destined For War: Can America And China Escape Thucydides’s Trap?]
https://www.economist.com/news/book...rc=scn/fb/te/bl/ed/willamericaandchinagotowar
''Graham Allison, a Harvard scholar, thinks the world underestimates the risk of a catastrophic clash between China and the United States. When a rising power challenges an incumbent, carnage often ensues. Thucydides, an ancient historian, wrote of the Peloponnesian war of 431-404 BC that “It was the rise of Athens and the fear that this instilled in Sparta that made war inevitable.” Mr Allison has examined 16 similar cases since the 15th century. All but four ended in war. Mr Allison does not say that war between China and the United States is inevitable, but he thinks it “more likely than not”.''
''China and America could blunder into war in several ways, argues Mr Allison. A stand-off over Taiwan could escalate. North Korea’s dictator, Kim Jong Un, might die without an obvious heir, sparking chaos. American and Chinese special forces might rush into North Korea to secure the regime’s nuclear weapons, and clash. A big cyber-attack against America’s military networks might convince it that China was trying to blind its forces in the Pacific. American retaliation aimed at warning China off might have the opposite effect. Suppose that America crippled China’s Great Firewall, as a warning shot, and China saw this as an attempt to overthrow its government? With Donald Trump in the White House, Mr Allison worries that even a trade war might turn into a shooting war.''