This was garbage as well.
My understanding is the Davidians purchased the foreclosed property after it's drug-dealing previous owners were busted and put out of business.
Your understanding is partially correct. In fact, Koresh himself discovered drug lab elements and materials left behind by former occupants of the property, and called the sheriff to have them removed.
OSHA had a course on the chemicals involved and their combinations which could result from unintended combinations thereof, a definite possibility in a drug raid. Not one of the agents on the raid team had had either course.
Other excuses were fielded as well, but the DEA should have taken down a drug lab.
Texas CPS should have investigated allegations of abuse, physical o sexual which were bandied about.
The last agency which should have gone in was the BATF.
one more thing, the phones were tapped.(the 9-1-1 tape has the phone ringing on it like you hear when you make the call, not when you answer the phone. The agency knew the Davidian who worked for the USPS who had been asked for directions to Mt. Carmel by a media team coming to film the raid had warned Koresh of the impending raid, yet they ran the operation anyway.
It all reeks of a provoked, grandstanding incident which was later used to demonize Christians of any stripe as crackpots and dangerous domestic terrorists, the whole while decrying firearm ownership.
That is the very sort of tyranny the second amendment would have us be armed against.