New world order vs newest world order. Isn't that what Silas claimed from the very beginning? Since episode nine he was open about MECH's intent to be on top of the arms race, and to be the highest power. His choice to attack military personnel was probably just the beginning of live-fire tests and scare tactics. Attacking Fowler would also send a direct message of their intent. Maybe they thought they had their game-ender in successfully duplicating Cybertronian tech. It's possible they jumped the gun this time, but MECH has shown themselves to be forward thinking and to take their lumps for the sake of rebounding and advancing their tech further each time.