“ However, lack of control over what went on in the park caused a multitude of problems. Drug dealers and users arrived from all over Europe, and crime became rampant as dealers fought for control and addicts (who numbered up to 1,000 ) stole to support their habit. The once-beautiful gardens had degraded into a mess of mud and used needles, and the emergency services were overwhelmed with the number of overdoses, which were almost nightly. Platzspitz, or Needle Park as it was then known, became a source of embarrassment to the Zurich municipal council and in 1992, police moved in to clear up the park.[clarification needed] The drug scene then moved to the adjacent area of Letten railway station, which closed services in 1989. This spot was also cleared by police in 1995.

Today Platzspitz has been cleaned up and restored, and is presented by the authorities as a peaceful, family-friendly garden.”

https://en.wikipedia.org/wiki/Platzspitz_park?wprov=sfti1#

So hands off was a total failure, so they gave up and forcibly removed people.

Doing some research on needle park- it looks like the experiments with allowing drug use were a massive failure, absolutely ruining the park, and it was ultimately cleaned up by law enforcement

the quote is missing what happened after the Platzpitz and later the older Letten train station were cleared: heroin use was decriminalised - not legalised - but only in controlled locations under supervision from medical staff and social workers. It seems that solution helped in multiple ways: - no people using heroin on the streets - no overdoses - drug users became less criminal because they didn't need as much money to finance their use - the medicalisation of heroin use made it less appealing to new users by removing the rebellious aspect

Be cautious about applying lessons across significantly different culture.

Just because democracy took off in America doesn't mean it will take off in Iraq.

Just because drug legalization worked in Zurich doesn't mean it will work in Portland.