I did in my first paragraph.
Perth have returning travellers (like every other city) but the numbers are a drop in the pool compared to those flying into Sydney and Melbourne (you know, the two Australian cities relevant on an international scale).
This blather doesn't change the fact that all of WA's currently active cases are travellers or residents returning, or travelling, from overseas/interstate and appropriately quarantining (an arrangement the Federal Government is actively supporting litigation to stop WRT interstate travellers.)
And you still haven't confirmed what - in your belief - we should be doing with these people instead?