Based on what Zaos and Aleni heard while they were in the previous city, it seemed that the bandits stopped their attacks for a while when one group of them suddenly disappeared. Most likely, they will do the same again once they discover that another group of bandits has disappeared. So, they had to hurry, attack the bases and then decrease their forces before going to deal with the head of the family who was doing all that.
"Destroying the whole family because of a single greedy bastard is a bit too much," Zaos thought. "Still, unless we give a proper message, the successor will follow the same footsteps."