Which isn’t quite accurate as for example people prefer to move out of their parent’s homes while young adults but aren’t necessarily homeless if they don’t.

Basic housing is a necessity, but people also huge homes and 2nd homes etc. So housing policy should therefore be more complicated than simply subsidizing anything you can call housing. Capping the home mortgage tax deduction at ~median home prices for example is probably a better use of government funds.

That is the object of the sentence. He is asking who the subject is, in other words the thing or person that is doing the housing of the people. Is it the government? Is it you? I'm currently responsible for housing myself, which is annoying so I would prefer someone else take on this responsibility.