Not quite sure about the logic of using the word 'need' there.
You're not sure why sex workers might need to work to pay their rent and bills and feed themselves and their families if they can't access any (or only very limited) financial support? I'm surprised by that - it's pretty basic stuff and really not that difficult for most people to grasp.
Or is this the time honoured method of expressing disapproval of something by pretending not to understand it; (my mother is the queen of this passive aggressive crap)? If so, give it a rest.
EDIT: cross posted with SW, and be assured that any judgemental posts will be (and have been) removed