Because...they were Philistines.
"Phil" + "Hestia"...in Greek "love of the hearth" = Philistine.
My understanding is there is a good chance that after Troy when the dark ages came upon Greece the Myceneans moved to Canaan in large numbers.
Although I believe a few had already lived there for some time because "The Way of the Philistines" (the path Moses did not take which is mentioned in the Book Of Exodus) was already in existence (c. 1440 BC).
LOL