Do you think someone somewhere knows what they are doing, I sure hope so.
Not really. I don't think any western government involved in Libya knows who they have been supporting and what the outcome will be. No doubt the temptation to attempt to create an indebted client state in a oil rich country which had a strong debt free economy was simply too much for Western powers to resist.
Also involvement in Libya was an attempt by the West to grab some initiative in a region in which the situation was out of control and in which they were rapidly loosing vital influence. The Arab Spring was fundamentally a rebellion by the people against Western imposed, and propped up, repressive regimes. By taking the side of the rebellion in Libya, a country which they had failed to dominate, the West was hoping to be seen less as the villains, and more as supporters of freedom and democracy. The jury's out on whether the strategy will work, I have my doubts - the West has a history of screwing up when it comes to foreign policy.
Nor is the NTC anywhere like in full control of the situation, that has been obvious for a long time. Basically no one knows what they are doing - not the Western governments, not the NTC, not the rebels themselves. Generally in a situation like that after a successful revolution, a reign of terror ensues. Hopefully Libya will be spared that, but it's far from certain that it will be.
With reference to the execution of prisoners by the rebels, anyone who has followed events in Libya beyond the narrow confines of our media, will know that human rights violations by the rebels has been reported throughout the rebellion - execution of government supporters in Benghazi was reported soon after the rebels took control. The only thing that's changed is that the BBC, ITN, etc, are now apparently willing to report them.