I should note that Linda has given you the basic answer in her reference to free will. I think it is still worth pointing out things that Tom has said in another context that are applicable principles.
I suggest that you consider reading Tom's lecture on Bullying, Voodoo and NPMR Assisted Bullying
from My Big TOE Wiki http://wiki.my-big-toe.com/index.php/Bullying,_Voodoo_and_NPMR_Assisted_Bullying
. I have pulled some quotations out of the context of that 'lecture' because they are pertinent here. They are well described principles upon which the LCS operates which can be applied here to understand the answer to your questions, why the things you ask about a permitted to be that way when it seems like a waste to you. Basically, the answer comes down to free will. I have specifically pointed out some aspects quoted to emphasize them and clearly point them out.
While there is not a specific answer there, I think you can find the general and actual answer there. In this other context, Tom states:
Consciousness is an evolving digital information system, not your mother. It is designed to be helpful and supportive toward positive evolution, but can be abused by those on a negative path. Free will bestowed by the LCS is unconditional free will - not " you are free to do whatever you want as long as it is what I want". The system is an equal opportunity employer -- it allows free will to do whatever it does -- and then provides appropriate natural consequences. Remember, the LCS is not a benevolent little old man playing with his pet people. Unconditional free will is a logical necessity of consciousness and the LCS must develop its strategy-to-evolve around that fact. That conscious intent modifies future probability provides the major feedback loop that facilitates self-modification (a condition necessary for evolution), and that feedback loop represents another fact of life that consciousness must live with.
The LCS self-optimizes in the big picture and for the long term - not in the PMR little picture short term. Like us, the LCS also has a limited decision space and must make choices to optimize its evolution. It makes those choices based on the probability of entropy reduction along each of the alternative paths.
The system optimizes within its constraints. The outcome depends on what each character was likely to gain or lose for each of the alternative futures. Nobody's evolutionary potential or growth opportunities are seriously damaged. Typically, everybody wins. Remember, there are random components, not everything is planned - the system is probabilistic not deterministic - it works (gets it right) most of the time, not all the time -- it is not a perfect system. It achieves successful optimization at the system level more often than not.
There is further discussion there in terms of long term benefit and other things you might note but not so applicable here. The bottom line would appear to be Free Will versus major damage not being done. It might appear to be a waste, but then we don't have the perspective that AUM is applying. You might also keep the following in mind for general application into the future.
The rules provide structure and pattern to the whole. Much is according to plan. Additionally, we are often led to the experiences we need (that provide opportunity to learn grow) on the fly as our growth-needs and abilities to learn change. On top of all that there is some randomness within the system - in terms of interactions and opportunities - for better or for worse - every dog bite or virus caught is not necessarily part of a plan or in reaction to our own state of being - we simply must deal with what comes. Because we all have free will, there is a significant component of randomness in our interactions with others who are interacting with others who are interacting with others that depends upon the consequences of all the freewill choices made.
You need to generally realize that Tom teaches a lot of principles which we should make note of, not in terms of just their original point of application, but that they are generally applicable and can be used to explain or predict other aspects of the behavior of the LCS and AUM. That is why I refer you to these quoted concepts and indicate that they are applicable to answering your questions.
You might also keep in mind that while those persons appear stuck in some kind of useless loop, they are all still, as their IUOCs continuing to function as normally they do as a part of AUM and also as their continuing experience of NPMR. They might actually have already continued on to another PMR incarnation, just leaving this fragment of their attention locked into its loop and slowly playing out. Remember that it is possible to be engaged in more than one PMR incarnation at a time.