Koresh wasn't being charged with a crime.
It was a search warrant.
I'd love to see a copy of that warrant! From what the local Leo's said, Koresh was quite approachable and that they had been inside his domicile on several occasions over the years. They also stated that if they had been able to be the ones knockin on the door that things would have gone down a whole lot differently.
If I were Ashcroft I would send Horriuchi and Potts to Pakistan to go work their wares on Bin Laden. They'd be alive for about a day. They are equipped to deal with us the enemy not them the enemy. As is the whole alphabet soup.