I'm just gonna be lazy and link to what I wrote the last time the Rat Park page came up on HN: https://news.ycombinator.com/item?id=7743089 It comes up a lot, maybe because the result is kind of positive and aligns well with HN's crowds drug liberal views? The RP experiment wrt morphine addiction in mice has not been replicated. Also, afaik, Bruce Alexander had a hypothesis about drug addiction, designed an experimen…
"Liberal drug views" in general seem to have a lot of real world support, while hard-core punitive prohibitionism has been a failure in every way pretty much everywhere it's been tried... that is unless your goal is to imprison a large number of people, perpetuate cycles of poverty and crime, and route lots of money to the prison and police/security industries. In that case they're a big success. At this point I consider prohibitionism to be a crackpot view. I get the sense that with at least some people prohibitionism is supported as an indirect way to persecute minority groups. It was true back when the "war on drugs" was pursued, and I think it's still true today.
There are cases where certain liberal positions do not have real-world support and basically don't work, but this isn't one of them. None of our over-arching political bias frameworks (right, left, etc.) jive perfectly with reality.