Power was cut at the compound, and the Davidians were using kerosene lamps. This contributed to the fire.
Hostage negotiatiors off site were routinely fucked by the actions of agents on scene, who did things like play "these boots are made for walking" on loudspeakers at the Davidians.
Infrared video shows that as the tanks went in, people running away from the flames were gunned down. Survivors, the few there were, confirmed this.
Only three things missing from this summary.