"Still, it shocks many Americans to see no criminal penalty for using drugs illegally"
It only shocks Boomers. Their only answer to 'crime' was to keep making laws harsher until all the jail cells were full. Then to build more jail cells.
There's no need to have criminal penalties for drug use in the first place. What we want less of isn't drug use, it's the anti-social behaviors and health issues that often stem from drug use. Look at the other comments here - no one is upset with the mere ingestion of substances, they are complaining about the behaviors they see on the streets. Behaviors that impact the rest of use negatively. And we all know that a lot of that behavior has nothing to do with drug use in the first place. But it's a lot harder to deal with the behavior issue because then you're dealing with things like mental health issues and large-scale economic issues, on top of drug abuse.
It's so much easier to just use drugs as a scapegoat and start locking people up. Like the Boomers did! But we know that doing so is monumentally stupid and ineffective so we need a different way. Props to Seattle for trying a different way, but just as we've seen here in SF, these half-assed measures do as much to encourage anti-social behavior as they do to mitigate it. I think these West Coast cities being besieged by the nice-weather homelessness epidemic (and associated drug use) are going to have to come up with something a little tougher than what they've found the political will for so far. But we also have to acknowledge that we can't, won't and never should return to the idiotic War on Drugs.