Every service offered has only resulted in increased use, increased homelessness.
Safe injection will increase drug use, destroy communities, increase crime.
In the US it's obvious to anyone with eyes that cities that encourage/support drug use have a much worse environment (SF, LA, Seattle). Drug users are literally given free rides by neighboring areas into these cities.
Even cities known for being "rough" at their peak during the crack epidemic didn't have the brazen broad daylight property theft that plagues certain cities today. There's something about.
Heck, even today I don't think you could just break into a car and start stealing shit in a bad part of St. Louis without exposing yourself to some serious occupational hazards from passers by. It seems like on the west coast (and a couple places out east too) the biggest risk you run is people whipping out their phones and filming you.
https://en.wikipedia.org/wiki/Supervised_injection_site