FYI, most American cities aren't like this.
The article describes Portland for a reason: They're one of a small number of cities that experimenting with decriminalization (combined, theoretically, with treatment programs) under the theory that it would improve the situation. It has not improved the situation.
I think you might be viewing America through the lens of whatever stories make the news headlines, which is an aggregate of all the worst situations in the country. It's not representative of the entire country.
The US has about 200X more land than the Netherlands. It's huge and more diverse than you might be used to if you're imagining it as a parallel to where you lived.