IMO nothing touches opiates as far as addiction potential goes. That shit becomes as important as food, water, and sex to an opiate hijacked brain.
Still, yes I think they should be completely legal. Legalizing these drugs would completely destroy the black market for these drugs and greatly mitigate deaths from shit like fentanyl and carfentanyl.
Yeah, E on it's own is almost fucking harmless, but crackdowns on production meant they started passing other bullshit off and that killed a lot of people. The right wing press of course prevented any testing kits being made available.
Ditto (non-meth) Speed, which lead to Meth becoming more popular when supply dried up and fucking over the unwary.