I can't tell exactly the point you're trying to make. Obviously there are specific cases ("schizophrenics" here, I guess) who are going to be very hard to treat in any safety net, and the US has no monopoly on them.

But the point was broader, that relative to the rest of the industrial world the US has far more people at the "bottom" , falling out of the net. Walking around cities in Europe, you generally don't find people sleeping on park benches or camping under highway interchanges, etc... In most US cities, that's fairly routine. And many of us consider that a bad thing.

Note that none of that excuses the poorly informed and counterproductive moralizing in the linked article. The author is a jerk. But the problem is real.