From doing bits of homeless outreach a large part of the issue is that for any addicts on the street most hostels have a no booze/using rule, which means they'd rather be outside and high than trying to obey a hostel's rules. Fear of attack was mentioned sometimes, but never seemed like the main driver of street-sleepers. None of this is to negate the abject failure of social provision for addicts/ex-military/mental health sufferers who make up the vast majority of rough sleepers.
From doing bits of homeless outreach a large part of the issue is that for any addicts on the street most hostels have a no booze/using rule, which means they'd rather be outside and high than trying to obey a hostel's rules. Fear of attack was mentioned sometimes, but never seemed like the main driver of street-sleepers. None of this is to negate the abject failure of social provision for addicts/ex-military/mental health sufferers who make up the vast majority of rough sleepers.