Now, they think WE are able to be constitutionally banned from travelling?  Oh, what the country is coming to!  What should be the policy is simply that PEOPLE TRAVEL AT THEIR OWN RISK.  Whenever I travel, I believe I assume this.  The government is not responsible for what happens to me.  But take away my right to move about freely, and I will protest.

That said, I can't imagine ever wanting to go to certain places, North Korea, Middle East and Africa among them.  Discretion is always the better part of valor.