Why are ye come up against us? — Samson was not of the tribe of Judah, which seems to have been living in contented servitude.
Related Commentaries of Judges 15:10
Judges 15:10
10 And the men of Judah said, Why are ye come up against us? And they answered, To bind Samson are we come up, to do to him as he hath done to us.