Fireworks are dangerous

OK, so it was bonfire night last Sunday, and we went to Wendy and David's house for a do it yourself display. The garden isn't the biggest, though the fact they have one in London is something, but we figured we would be OK. The fireworks were bog standard quality (from Tescos I think) and all was going swimmingly until one didn't go up but actually headed straight towards David. Luckily he turned away, it bounced off him at us but eventually exploded in front of us in a bush, very loud, bright and scary. David was OK, except he had a hole burnt in his jacket.

So maybe we'll go to an organised display next year.

What I want to know, however, is what actually inspires people into thinking that this is a good idea????