Are your suggesting in your first sentence that Pakistan does not have a high court?
If multiple countries are cooperating and sharing intelligence and evidence (per Ambassador Haqqani the US already is with Pakistan), then there should be nothing to prevent them from using the avenues available (The Pakistani justice system, all the way to the Supreme Court) to continue cooperating and make their case against the perpetrators to get them behind bars.
The UNSC can indeed ban organizations, and Pakistan has indicated it will act, but it cannot make Pakistan extradite any individuals, nor am I aware of what action it requires of member countries, other than restrictions, against people designated as 'terrorist'.
The perpetrators of the Mumbai attacks are not going to the gallows because the UNSC declares them terrorists - they will meet that fate only when condemned by a court of law, and for that cooperation on investigations, evidence and intelligence is crucial.
We have actually digressed from first acknowledging the fact that there is an issue with these organizations (which is where I was aiming at, not whether Pakistan has a high court or no - I have some understanding of Pakistan which is why I am here on this forum)
We were at "like minded nations" ganging together, or "show evidence first" and then we will do something about it, juncture.
Action, court trials, persecution will come later.
First comes the need to look at the incessant finger pointing, cohesive international pressure over the elements of these organizations, and instead we have a feverish debate, bent on rebuttal, falsification of evidences, weaving alternative theories out.
Amidst this broader mainstream notion being fed into the minds of pakistani populace, by media and even some government officials - there must be some REAL work going in behind the curtains where intelligence is being shared, the evidences are being produced, and it will have to overpower the mainstream notion and Government would have to do something about it sooner or later, and then this mainstream notion would fuel further rage in the populace.
And I completely agree to the moral deficiency of certain superpowers engaged in this that you mention, it is irrefutable and hard to counter. I will not engage in this, or to put it correctly, I can not engage in it. Its a lost cause.
The only way forward is by terrorists going on the way they are (they shot their chances to continue to thrive in India by targetting Americans & British in Mumbai) and if they go on spreading such sick terror further, they would end up gaining universal hatred and detest. As I see it today, there is a lack of it and infact, a rather hush-hush acceptance to some of their cause and means which dents the confidence and determination required to weed it out.