I don’t think they should ban them. But if you act badly on them the charges should include “under the influence”.
Let darwinism work. If idiots want to fry themselves with bath salts – let them.
You ask why a doper snorting bath salts is your problem… It’s only your problem if you let it be your problem. I choose to ignore the issue. It’s not my problem unless I want to snort bath salts.