So, why is Ghostwalker still alive?
The big reason is that, for all his power, he's currently in a hostage situation, where six nations (Well, four now, really) have citizens in his city, with him at the center of it, and any big activity taken against him could be the spark that ignites war. The Sioux don't trust the UCAS, the PCC absorbed the Ute, the Azzies are gone, the CAS is on friendly terms with the UCAS (But there was that coup attempt a while back) and is friendly with teh PCC, the PCC tries to balance things, and it's all just a mess.
What happens if the UCAS drops a nuke on Ghostwalker, eradicating most of the city in the same move? How well does that sit with teh NAN or PCC or, heck, eve the CAS? Thro shot's a tad mroe feasable, but there's still collateral damage and less chance of hitting. MISSING him in such an attack is bad news.
The Azzies would *love* to get him, but, again, blowing up Denver's no good and, now, they have all of the PCC between them and the city and Horizon is chomping their hindquarters at every turn, PLUS they're fighting Amazonia. CAS certainly won't let them fly over for a different angle, so, they can't get at the city aside from small shadow teams, which, let's be honest, can't do much in the firepower department unless you want to break out a suitcase nuke and there, once again, we get an outbreak of war. To use a modern comparison, it'd be like Iran trying to attack Saudia Arabia, but Iraq is in betwen the two and has utterly no intention of letting armies trot through it to get their war on.
Now, all that said? I'd lay good odds that there are *plans* to deal with him, that there are *hopes* that he can be taken down, and probably diplomatic channels are buzzing with such talk, but assorted politicians need to cover their hinder before running in and killing thouands, if not tens of thousands, of civillians, which could be their own or those of recently-hostile foreign powers. There are probably task forces and special subcomittes and so on, and Damien Knight is contracted by the UCAS to draw up some cool battle plans that will be sealed in a safe for if the president ever orders 'Operation Whitewash' or whatever it gets called.
Right now, business still operates there. Deals are made, negotiations go through, brokering happens, people get food and buy things ... you just have a guy on top of teh castle going, "As long as you call me king, we're solid", and he has bombs strapped to people's chests and a detonator. Crazyman lets stuff get done, they're nod along and pay him lip service, but if he starts blowing up people, well, if they're gonna die *anyway*...
That's my reaidng, anyway.