Philistines were never included in this list of Canaanite people. They came from somewhere else.
The Philistines had five great city-states, each with their own king: Ashkelon was the only port city. Gaza was Philistia’s southernmost city-state, Ashdod to the north was a bit further inland, and even more inland was Ekron, known for its olive oil export, then Gath was to its south.
I Power Struggles in the Patriarchal System, II Sexual Seduction, or Personal Power? III Spiritual Perception (Or, perhaps, the lack thereof) A 20 minute presentation
The way Amos chose to depict himself was as a simple man minding his own business, tending to his farm and family, when God came barreling in with an urgent message