I am not disagreeing with you, but fireworks have caused far more fires over the years. Two years ago, fireworks caused the M5 motorway pile up which killed 7 people and injured 51. I don't remember a call for fireworks to be banned after that far more serious incident.
I am amazed the recycling depot was not covered with netting, our council run one is. And the fire brigade said there had been 15 other fires at these sites in the last two years, which makes one suspect that they are not very well run.