I have thought a lot about this and have finally come round to your point of view. I was there on the night and witnessed the bus attack. There is no doubt the players were affected by what happened and we were three down after 30 minutes. The attack was ignored by the media but it was sustained and violent. It involved thousands of people and hundreds of missiles were thrown. It was not a small incident. It was arguably the worst direct attack on players by fans the UK has ever seen, certainly in its scale.
The Boca Juniors coach was attacked by River Plate fans before the Copa Libertadores Final and the match was abandoned by the authorities. If City had simply refused to play we would have been slaughtered by the press and the game would have been awarded to Liverpool. But a long-term precedent would have been set and the authorities would have been forced to act.