Just how dangerous is it to visit North Korea ? what are the dangers of visiting North Korea ?

Do not keep an open mind. Tours are incredibly stage-managed. If you want to find out about North Korea you're better off reading books by defectors and traveling to the China side of the border to see North Korean truck drivers there.

It's safe enough to go to North Korea if you want to, just don't expect to learn anything true.

It's not just a place to go just for interest.

It should be safe if you follow all the rules. I’ve heard they do accept tourists on guided tours only. I’m pretty sure they don’t just let foreigners wander around the country by themselves. There’s strict rules people must follow, but if you do what you’re supposed to and don’t act like an idiot, I think it would be an interesting place to visit. 

A visit there is only dangerous if you make it dangerous. Instead of focusing on the dangers, focus on the culture and practices and keep an open mind.

As long as you don't do anything stupid, it's safe. Search Otto Warmbier.