The entire point of the game is that folks can choose which side they want to fly on. It doesn't matter. You go to the SEA you change sides every time. You go to AvA you do the same. You should pick the side you want to fly or have the most friends in. Doesn't matter if you switch (IMO).
That is, of course, as long as you're not being a tard that's dropping supplies to enemies, occupying a CV and driving it right into the enemy for it to be sunk, etc.
I fail to see the issue you folks have with side switchers, personally.