I just watched the Waco on Netflix. It was surprisingly even handed and didn't paint the ATF or FBI in a very good light.
I think the problem, and we still see this today, is that the government just decides to curb stomp certain people for breaking the law. Then when things go south, they blame all of their poor decisions on the criminal suspect. "I wouldn't have had to kill all these people if you hadn't broke the law and brought me out here in the first place."
The original ATF raid was meant to be a display of force when they could have just as easily scooped Koresh up the next time he came into town to buy groceries- they had an informant literally in his house who snuck off right before the raid started.
Then, it seemed like the FBI's hostage rescue team was constantly undermining the negotiation team. They interviewed the lead negotiator, and he was basically pushed off the case because he kept butting heads with the tactical guys, and after he left not a single person walked out of the compound before they burnt it down.
It was like one of those action movies with a hostage situation, and the negotiator keeps getting overruled by the police captain because this is his operation that's going to put him in the spotlight and give him a chance for that big promotion, and he's got a huge chip on his shoulder so they keep butting heads and tells the guy to get the fuck outta there because he knows what he's doing and the negotiator probably has bad rep at the station for some stupid thing from way in the past. Then the captain makes a mistake and one of the hostages gets shot or something and finally the negotiator is like "You fuck this up man, they're not gonna take your badge. They're gonna have your head. I know how guys like this think. Let me talk to him.", and finally the captain relents and lets the negotiator do his thing and he saves the hostages and the captain has egg on his face but they're all on the same team and the good guys won in the end.
Except the complete opposite happened and everyone died. It's ok it still worked out in the end because the captain became the Attorney General of the United States.