They may be able to find clues as to why firebenders felt they needed to wipe out the airbenders. Perhaps the firebenders found evidence of a secret cadre of vacuumbenders
?
The Southern Air Temple is near the Southern Water Tribe.
The Northern Air Temple is on the way to the Northern Water Tribe.
The Eastern Air Temple is amidst the breadbasket of the Earth Kingdom.
The Western Air Temple is near the seat of the Fire Nation.
It kind-o'makes sense to reveal the Air Temples this way
.