People get literally murdered simply because they are homeless and for no other reason. Health problems that would be readily and easily treated if you were in housing turn into medical emergencies on the street.

I'm well aware that correlation does not imply causality. But I also know for a fact that homelessness helps shorten lifespans.

And in the US, even if it were the case that we simply dump our dying on the streets instead of providing hospice, that would be plenty atrocious right there. And we do, in fact, do a certain amount of that. But that's not the entire explanation for the statistic.