Welcome to the boards epain
However, I'd point out that opioids, alcohol and benzos are ALL CNS depressants, and, as such, all can kill you via OD.
It's all about tolerance ... there was a time I easily could've taken 50 percocets worth of oxycodone w/o OD'ing ... surely a 'fistful' if there ever was one. But that's enough to kill like 3 people w/o any tolerance to opioids.
I'm fairly certain the same principle applies to benzos
I hear what you're saying about treatment though in the sense that there's no 'buprenorphine/methadone' equivalent for benzos.