It sounds to me like the people who are overdosing on the fake LSD are taking way to much of the substances to begin with. If someone takes 10 hits of what they think is LSD and it is actually 25I, they might die, but then I have to ask what the heck they were thinking taking 10 hits of LSD to begin with. I think sometimes it's a drug abuse problem as much as it is a drug mis-identification problem.
On the other hand...
According to Erowid, a strong dose of bath salts is 15mg and a strong dose of MDMA is 150mg, so I guess it would be hard not to overdose on bath salts if you thought you were taking MDMA.
Anyways, if someone sold me 100mg of MDMA that I later found out was actually bath salts, I might be thrilled. "My one dose just turned into ten doses!"
Every day I am thankful that I was introduced to psychedelic drugs.