The one's who are kicked out of housing due to their domestically violent/criminal/antisocial behaviour. Or the fact they are migrants, not refugees, that have no recourse to seek asylum or any kind of assistance from the UK.
So they're offered night shelters but choose the streets where they don't have to abide to any kind of even loose rules.
There are plenty of drug-using hostels in many cities collaquilly called 'wet houses' where people can be housed full time and drink and use drugs and it's accepted as serving the most vulnerable demographic and putting a roof over their head but it still doesn't suit some people as there have to be some rules in place about theft, violence and sexual assault on staff and other residents being unacceptable.
To access a lot of those kind of places, the individual has to have been referred by a council homelessness worker or mental health or addiction worker.
MN seems to think it's the tragic homeless victims of Tory policy that have been let down by the system that Braverman is going on about.
I don't think she is, she's quite clearly talking not about victims of a very clear housing crisis, but another demographic.