I’m not disagreeing with you - but people have a right - and they can exercise those rights.
My last had two WL situations. She stayed on one but not the other. Her choice. If she had done zero or two, also her choice - and never wrong.
It all works itself out.
I don’t see anything ethical for someone choosing to stay on a WL (of course, unless they had an ED acceptance - but that’s a different situation - i.e. not unenrolling everywhere).
So we can agree to disagree - but in the end, people will do what they’ll do - and somehow it has a way of working itself out.