Actually that is a good point, however given that the coal industry was heavily subsidised for decades, I suspect that in comparison the City is still extremely profitable with a very good chance of paying dividends on the taxpayers investment. Perhaps with a little less militancy and a bit more foresight the miners could have salvaged far more of their industry than they did by excessive wage demands and strike action.
The point I am illustrating is that both sides were at fault here, the NUM and several Govts....Thatcher, right,y or wrongly was just the one who refused to blink first.
The City is equally, if not more, subsidised from it's deregulated birth helped with oil revenue up to the latest farce. The public are at its mercy. Too big too fail.
No industry has ever been given that status. She created a monster and all people can do is crow about it.