‘homelessness’ (mass noun) 
The state of having no home.
‘families are facing homelessness’
‘she described the problem of homelessness in the city’
‘The national agenda to end chronic homelessness is an improvement over past efforts to manage homelessness.’

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‘rough sleeper’ (noun)
‘a person who sleeps without adequate shelter, especially on the streets of a town or city; a homeless person.’

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‘the public’ (noun)
[treated as singular or plural] 
Ordinary people in general; the community.
‘the library is open to the public’
‘the general public have a right to know’

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‘hostile architecture’
also known as defensive urban design
‘a controversial urban design trend in which public spaces are constructed or altered to discourage people from using them in a way not intended by the owner.’