Is it not journalism though ? I'd say there is some value of having regular reminders of what North Korea is, even if I totally understand what you may find unsavory in the idea of touring the place.
Short cool story bro here : I found in a dumpster a 1982 guide for doing tourism in the USSR and took it home. I only went though it in a pretty light fashion, but it was pretty telling by itself. For instance, the to do list for "motorized tourists" has in number 2 (just under the fact about cars driving in the right lane) that tourists "should not deviate of the roadmap established by Intourist".
The train chapter starts with : "All the trains in the USSR are on time and very punctual (when they're not canceled for mysterious reasons)" 
I don't think it's journalism because everything an outsider experiences is controlled by the regime. It'd only be propaganda unless you're willing to take some huge risks which would endanger the lives of innocent North Koreans, too. I'd definitely like to visit there but not while the people are under the thumb of that dumpy little piece of shit.
Morbid fascination is certainly a thing but there are other possible motivations for a tourism trip. Interest in historical sites, artifacts or natural wildlife. A genuine desire to go meet the people and judge for yourself, no matter how naive it may sound when dealing with a regime fond of Stalinist staging, God knows there were an awful lot of those in Cuba, the USSR or the PRC.
I've got mixed feelings about Cuba, too. I think it's good the the US is normalizing relations but at the same time the Cuban people have been treated like pawns for a hundred years by the USA, USSR, Castro, Batista, Machado, etc.
