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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.
I listened to something the other day, forget where it was. They were speaking to someone who said the worst thing is they'd rather chance it on the streets than deal with the people in hostels who attack you/rob you whilst you sleep.
I can't imagine how disturbing it must be to try and snatch a couple of hours sleep here and there for fear of being attacked