Obviously they just have to stop choosing their addiction in his sadly small closed and privileged little mind. He has no bloody idea.
Homelessness combined with addiction has always been an issue. A lot of it does start on the street, but tbf a lot doesn't and is where people with multiple problems end up.
Which came first is actually pretty irrelevant unless you believe in deserving homeless and undeserving homeless, which of course many sad sacks do.
Many nameless people quietly died on the streets when I was young. They all had their reasons for being there. They still do, we just do more to find out who they where before disposing of them than we used to.
TBF I did choose being homeless. I came down to London well underage with very few illusions, but even at it's worse it still looked like a better deal than what I'd walked away from, and frankly it was, before a long time later I was finally reported as 'missing' and thrown back into far worse situations with no choice.
I'm lucky in that I pre date public begging as acceptable, which previously streamlined those automatically headed for death, those to prostitution or crime, and those who would manage to make something of their situation, a lot faster than the current situation.
I saw many others succumb to substances and several killed by people who knew the homeless held no value to society, but no one was really that bothered until it stopped being invisible and was in their faces.
Amongst all the traditionally homeless groups, there are people now in London on the streets, no substance issues, and holding down jobs, who simply don't have more than a tent for a home. Winter is coming for them too.
Creating out of the way shelters, living in underground tunnels, and squatting abandoned property allowed so many who wanted to, to get off the streets, find work and create communities and futures.
Now we have a situation where the small minded find it better that people litter the streets begging for their survival often locked into funding addiction, and semi derelict houses stay empty, tunnels are gated up, and basic hidden shelters are immediately removed, than that anyone should use them to better themselves.