OK sure, but the problem is more the existence of public property producing the "tragedy of the commons" issue.... Everyone's experience with this is different, but from my point of view living in a major US urban area, the problems of homelessness are much more pronounced than that of immigration....
And I think there is data to bear out the conclusion that homeless people are far greater consumers of public services and "disrupters" of public life (in whatever context you're referring to be "forced association") than immigrants.
