I would say its two pronged. One is definitely helping the homeless but another has to be upholding law and order. Otherwise people like that guy the article mentions as minting 10k euros per squat is going continue whether he has a roof or not. Its a classic broken window syndrome. If a small crime is tolerated for any reason, it encourages bigger crimes or organized crime (like the stories about stores not calling cops in Cali due to lack of response).