Selfish Potion (Devil Horns) should have been acquired exclusively from the rubble piles. The name matches the deed and is a completely selfish act to spend all your time looting the city instead of helping evacuate.
Selfless Potion (Halo) should have been acquired exclusively from saving people (citizen rescue reward bags). You spent your time looking out for others, so the reward would match the deed.
By the end of it all, we would be able to tell who fought for lion’s arch citizens, and who was a jerk and thought only of themselves. Or at least who was savvy enough to take care of both!
I’d really like to rant about how the Heirloom farming takes focus away from the main event, but I have a feeling the designers of this event did it completely on purpose knowing players would do nothing but collect them. So instead, if you do similar ‘distractions’ for future world content, at least give us a way to praise those who helped and give dirty looks to those who didn’t and want to brag about it.