Adam Clarke on Judges 2:12

Which brought them out of the land of Egypt - This was one of the highest aggravations of their offense; they forsook the God who brought them out of Egypt; a place in which they endured the most grievous oppression and were subjected to the most degrading servitude, from which they never could have rescued themselves; and they were delivered by such a signal display of the power, justice, and mercy of God, as should never have been forgotten, because the most stupendous that had ever been exhibited. They forsook Him, and served idols as destitute of real being as of influence and power.