I also read one of the books this series was based on "Waco a Survivor's Story". One thing that I learned was that if Koresh had just properly registered the guns he would have been fine as far as the firearms were concerned. There was no law against stockpiling them.
Now DK did have issues being a polygamist fathering children with underage girls. However he could have been picked up while he was in town there was really no reason to storm the compound. I believe that the ATF wanted to flex its muscle after Ruby Ridge and make an example of the Davidians.
I don't remember Holder being mentioned but Janet Reno and Clinton were involved. Hard to believe they OKed a plan that was sure to lead to the massive fire that ensued based on similar incidents where the teargas was used.
My conclusion after watching: if you aren't a mainstream religion the government deems legitimate and you have access to guns then you could find the black helicopters flying over your roof.