Given that a LOT of people wear wristbands nowadays, for all sorts of reasons, many of them social conscious reasons, I don't think the wristband idea is a bad one for speedily recognising who qualifies for a meal. Looking at papers is simply impractical. For a start you'd need more people than you need to qickly check whether someone has a wristband.
Wristbands are not nasty badges. My daughter wears wristbands. So do her friends. I very much doubt if it's the wristbands that "set off" the horrid people who apparently abuse refugees.
I think this is a lot of fuss over a little, sensible, practical thing which, like refugee status, is a temporary, coping mechanism.
Anyone who thinks it was a terrible idea should come up with a better system. "Papers" is not a better system because it takes longer to assimilate the information. A wristband or other badge is like a graph: all the information you need in a very simple format.