The increased supply of hard drugs & the apparent lack of enforcement against the supply chains of hard drugs.

What does that have to do with neoliberalism? Also, you'll have to say which presidents you see as being responsible. Wikipedia says Trump was neoliberal, I've seen it applied to other presidents. Trump was impactful on the world because he was so ineffectual in general. But I think every president in living memory wanted to reduce drug use and the supply of drugs coming into the us. In a free society it's hard to stop people from doing what they want, even if they take drugs that hurt them, kill them, or might not do anything bad (like pot), large numbers of people can supply enough demand to overcome the impact of law enforcement.

Of course fentanyl is a society destroying thing, the impact of that and things like heroin lead to me not knowing what to do personally to stop this. Media reports claim fentanyl components are coming from China. So now what?

First, I take Wikipedia with a grain of salt, especially when it comes to politics or anything remotely related to politics.

All I'm saying is that the results speak for themselves. The drugs come from somewhere. The drugs are allowed in somehow. Repeat violent criminals are somehow let out of prison.

Also, there is a history of collusion of governments, government agencies, NGOs, & drug trafficking. This spans over hundreds of years & there are recent cases. Watch a documentary of how Compton, CA was once a working class neighborhood with industrious people, then the CIA trafficked drugs in that neighborhood (note Freeway Rick Ross), & it quickly devolved into violent gang warfare. Now the land is being bought on the cheap. Note Sofi Statium, which is built on the ground of what were once homes.

Another case in point is the Mafia. Where did the Mafia go? Did the members & families just disappear. Now look at the likes of Nancy Pelosi. Who is her grandfather? Even Wikipedia will tell you...