I guess it depends how you define "people" — clearly "people" do still want to visit the square — to shower, poop, hang washing:
Hamilton City Council is wrestling with what to do about people showering in a central city fountain. …
there are [also] people defecating, hanging clothes lines, taking drugs, begging and displaying threatening behaviour in the square. …
If you reach a stage where … people don't want to go to Garden Place anymore then I suggest it's time to make a change.
Via: Hamilton grapples with people showering in town square | RNZ News.
Clearly there's a need for some kind of facility to cater for the needs of the people using the square in unintended ways. How about finding a way to create that facility, rather than just talking about moving those people on? Then you can talk about which behaviours are acceptable in which places.