This lemming behavior CAN be used to your advantage, especially if the "winning team" gets hammered by ENY.
You switch to the losing side, lift what you want, and start hunting all those folks forced out of their Lalas, Runstangs, Splixteens, C-Hawgs, and Nikis by the ENY. They are upset they are not in their uber ride. Their piloting shows it.
A frustrated-target rich environment. Not good for running up your own score using higher ENY planes against lower ones, but if the effect is bad enough, it is definitely a good occasion to gather a couple friends, get some discount Me262's, or other (now cheap) perk or high end rides, and terrorize as many of the enemy as you can manage.
Flying defense of the losing country against the horde also guarantees lot's of quick fights against overwhelming odds. This can be especially fun in some planes like the Ki-84 if their ENY really has them in EW crates they are not used to flying.
Make it work for you.