Although there is the issue of people celebrating her death, that is a sideline to the main points in the argument.
Of greater importance imo, is the need for Thatcherism to be put in it's historical context and shown for what it was- and unfortunately still is.
As I said earlier, those of us old enough to know the pre-Thatcher era can see the big picture. The Falklands, privatisation, even the miners, no matter how important individually, are just pieces of the jigsaw. Thatcherism engendered a complete change in people's attitude to themselves and society- a return to the rule of greed and selfishness and sod everyone who isn't me attitude which has been with us so long now that many people under 40 don't even realise there was an alternative.
She wasn't solely responsible for that philosophy, of course, but she is representative of it, and her death is seen as emblematic. Of course, the philosophy is entrenched now, and it's hard to see how it can end, but for some, it must be seen as the only form of justice they are ever likely to get.
Like I said, I won't celebrate her passing- unfortunately her legacy lives on- but I can understand those who will.
I think the uncritical hero worship by the establishment is in danger of becoming the accepted version, and so the public show of anti-Thatcher sentiment serves as a balance for those who didn't know, or didn't care, about her and the effects of her tenure.