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There's a reason why the US governments says that El Salvador is a safer place to visit than Sweden (or Germany, or most other nations of Europe).

Because the criminals are in jail, instead of imported and allowed to roam freely in the streets?

That's part of it. The umbrella reason is that those nations didn't manage mass immigration well. On top of accepting more immigrants than they could absorb, many of them didn't want to integrate into the new society. Conflict ensued.

It was all part of the plan for controlled demolition..