Can America Tourists visit North Korea?

I think it's possible with a special pass but it's not recommended, it's a very dangerous place, even your hotel rooms are bugged and it's a ruthless dictatorship.

Most of answer is no. 

See Google's answer

Individuals cannot use a U.S. passport to travel to, in, or through North Korea without a special validation from the Department of State. Special Validations are granted only if it's in the US national interest to do so. Tourists are considered to be participating in activities at their own risk.

Then my point is Why you shouldn't take the risk? :)

You shouldn’t. Visit South Korea, Seoul is safe, basically the next Tokyo technology-wise.

Yes.But they can not move freely as they want

No, they cannot visit North Korea.

Yes but not freely & why would an American ever want to do that. 

Only the stupid ones.

Smart Americans have rational notions in their brains that prevent them from going to North Korea.

Sure.  You can check in, but you can never check out.