los angeles bomb squad planned demolition didn't go as planned

They planned for one outcome and expected something different. What happened was unexpected.

Fireworks disposal is meant to happen at a bomb range specifically because fireworks are bombs... there are tons of cases of fireworks disposal going wrong even at a controlled bomb range. So in what universe does it make sense to detonate 2000kg of explosives inside a city?

I can't find the safety video, but one particular case that stands in my mind is another case where people wanted to take shortcuts in the disposal of illegal fireworks and filled a barrel with the insides of the fireworks, soaked them in gasoline, then tried igniting it all off. This actually happened at a bomb range but the results were disastrous (many explosives left the barrel) and worse, we now had a flaming barrel full of explosives which hadn't gone off yet creating an even more dangerous situation.

I recall another safety video explaining how storing too many explosives in the same place caused an issue where an employee developed a static charge and ignited them all..

You don't take shortcuts in the disposal of explosives.

If he hadn't fallen off a cliff recently, Wile E. Coyote would call be call into news shows as a pundit today via a dynamite-stuffed tin can attached to a burning electrical wire and say, "Those cops were dumb to think it wouldn't explode."