Samson does not rebuke the Judahites for coming down hard on him. His answer simply reveals he is motivated not by a desire to help his people but to gain revenge for himself. His word, “As they did to me, so have I done to them,” makes up the anti-Golden Rule; it is the child on the playground saying, “He hit me first!” There are numerous uses of “do” in this chapter (Judges 15:3, Judges 15:6, Judges 15:7, Judges 15:10 [x2], Judges 15:11 [x3]), and they are mostly related to doings of vengeance and retaliation.
11 Then 3,000 men of Judah went down to the cleft of the rock of Etam, and said to Samson, “Do you not know that the Philistines are rulers over us? What then is this that you have done to us?” And he said to them, “As they did to me, so have I done to them.”