I was born in 87 so have little first hand knowledge of Thatcher but to everyone saying she could have been more diplomatic and consensus driven with the unions, was that not what Heath, Callaghan and Wilson tried and spectacularly failed at in the preceeding years?
That is exactly what happened. Governing by consensus in that aspect had failed and certainly by the time it came round to Callaghan, it had failed spectacularly. The unions needed reining in and rather than embracing the need for change, they did what most do which is become overtly aggresive in this face for change instead of playing a smart game and going with the flow.