What we have here is the right wing 'great man' fallacy, or in this case, the 'great woman' fallacy.
The other issue is that beneath the surface, the 'right to buy' project was not an inherently progressive one. Sure, it enabled a minority of council tenants to get on the mortgage ladder but on the flip side It served to enable the better off, upper-working-class to purchase homes permanently, which would otherwise been in circulation for the use of poorer, more vulnerable people. In many ways, it only served to exacerbate the gentrification and housing shortage within British housing estates. The least well off owe Thatcher no 'gratitude'.
This thread make me think of this image that I saw on facebook earlier...
