Even in a city like Stockholm (with a very strong social health system), there are homeless that might not fit in well with society -- granted the social net is much better.

I've only seen one or two in my brief winter visits, but my last trip a couple of weeks ago, there was a "tent city" under one of the bridges near Gamla Stan as well as assorted out of the way individuals (camped out near buildings) in Normmalm/Kungsholmen. With nice weather, I did a lot more walking/exploring this last trip.