The Ministry wanted this over with, and they were done trying to play nice. The Chief Mugwump cited that the security in the Courtrooms was paramount and that the dissidents who were still trapped in Hogsmeade were to be neutralized by any means. He gave them one last chance to surrender peacefully, but only received threats of killing all of the Purebloods and their sympathizers, himself included. Why do they think I'm the enemy?