I am sure that the so called 'fools' in the MOD would love to keep all the vehicles and bring them back. Unfortunately, as already mentioned they were purchased under 'Urgent Operational Requirement' which means the money comes from HMT and not the Defence budget. To keep these vehicles, the MOD would have to 'buy them back' or ' bring them into core'. It is not just the vehicles that have been purchased under UOR but a whole lot else including, as already mentioned, Reaper.
The MOD is broke. It has no money. It has been told by the government to cut its spending on top of paying back its debts. It is engaged in a war and a small scale intervention. It is struggling to afford some of the equipment it needs for the future (post 2020). Amongst all of this, it needs to decide what equipment it needs to 'buy back'. It cannot afford any, to be honest but some items will have an overwhelming case for retention and this will be the subject of upcoming planning rounds like PR12 and PR11 before it.
These 'fools' in the MOD therefore have the very difficult issue of meeting their standing commitments whilst trying to scrape together enough money for the future in order to defend Britain's interests worldwide, whilst having the budget cut and dealing with the legacy of past ministers who would not make difficult political decisions lest they lost votes and now we have the Pprune armchair specialists up in arms because equipment (which does not belong to the MOD) will have to be left in theatre/disposed off.
Simple household economics really. If you have a company car unless you can afford to buy it off your employer, it will go to the big auction in the sky when you no longer need it!