All according to plan.
Those pushing the fentanyl along the lines that you have posited forget about one thing that might bite back at them. The more those with weak addictive personalities are reduced in number, the harder it will be to deal with the stronger hard nosed non addictive personalities that are left. Those pushing the drugs think they can weaken the USA by us having to devote resources in the care of the weak that would otherwise go into shoring up our economy and military postures. If a potentially catastrophic existential event occurs that threatens this nation’s existence, I suspect the popuilations trying to survive will go very conservartive and show little love for those caught up in drug or are stuck in whiny gender or alt sex identities. Just finding stuff to eat and trying to survive would cause many to rethink their “lifestyle” choices...such changes would be forced upon them.