Yes, he needs to be charged as a traitor and hanged. Osama is an enemy, but this guy is a traitor... worse than an enemy. And our enemies would like nothing better than to spread how to make dirty bombs across our country.
So, if this traitor knows how to spread that knowledge, he, in himself, is a dirty bomb and must be contained and disposed of properly.
If you have a way of doing that safely, we would like to hear it.
Pretty simple: a trial just like McVeigh got and punishment to fit the crime.