As someone who's now lived in 5 countries let me just say : your post is absurd. All of those countries have governments that "successfully provide several means to prevent ..." and ... in none of them was it a problem to find people sleeping on the street. I never once actually tried to find them, incidentally. Just take some trains in any large city.
Which is that country that supposedly prevents these situations ? I'm sure finding a picture won't be a problem.
But I know, it makes you feel real good about your own worst-case future to think that doesn't happen. Now go out and talk to some older people that have had a bad run, and I guarantee, even in the Netherlands, you'll feel a whole lot worse about it. None of the other countries come even close to what the Netherlands supposedly does (If you don't mind living in a building where you get attacked daily for being old that is. Or the social worker doesn't like you. Or ... And let's just not discuss the waiting lines to get to talk to someone if something goes wrong)
I just don't know where people get the idea that the government has their back. Incomprehensible. I mean, sure they have rules and regulations that may help in specific situations (especially for rich guys to pay less tax I mean), but help people who are powerless ? Good luck with that.