This was because the player villages were scattered all over the place in the wilderness, and they would require a lot of time to find. Moreover, after destroying a few, the rest would most likely send all of their people to the system main cities, which would make their job in attacking the system main cities even more difficult.
As such, Zhao Fu decided that they would first attack the system main cities before getting rid of these player villages – that way, they would not have any way to resist.
However, now, each system main city had a battle force of around 1.7 million people, which was not to be taken lightly. In that case, should they do another assassination? After what had happened, they would most likely be incredibly wary, so it was unlikely that such a thing would work again. Moreover, the players and residents would make things quite difficult as well.