The BATF's plan was to shoot the Davidians' dogs, then burst into their home and start throwing grenades. This plan was to be carried out regardless of anything the Davidians might have done to cooperate with a search.
The BATF did not have a no-knock warrant. That they started shooting and engaging in deadly force (concussion grenades are not as likely to kill as fragmentation grenades, but can still be deadly) without legal justification makes them criminals.
Further, the BATF fired thousands of rounds of ammunition randomly, including in the general direction of other BATF agents. Given the absolute recklessness of the BATF agents, it's amazing that there weren't more than four agents killed by friendly fire.