Because thirty years ago Milton Keynes was a very small place population around 50,000 and in the early stages of development - now the population is in the region of 250,000 and increasing year on year faster than any place in the UK.
As the town has grown so has the demands for infrastructure, leisure facilities and entertainment
In the early days the 'locals' who were football supporters travelled to Northampton, Watford and Luton for League football and many of the new inhabitants were coming from Glasgow, Liverpool, London and yes even Sheffield - perhaps a tad to far to travel every other week to see their team.
By taking Wimbledon to Milton Keynes, Winkleman supplied League Football to the emerging population of Milton Keynes - the reason that Wimbledon was available was that Merton Council didn't want to back them and they onl;y had a small hardcore of fans - they were bust, no money, broke and going to the wall.
For football fans to call them is hypocritical - read Fit & Proper by Matthew Bell & Gary Armstrong - Sheffield United in the 1990's haboured UK's biggest white-collar fraudster, also had a chairman that couldn't decide to be a man or a woman, also had a chairman subject to an international arrest warrant and another chairman who is a fugitive from the law who was in turn succeeded by a man with connections to Libyan arms dealers
MK a disgrace - look in your own back yard first before throwing stones!