Actually I think it enhances the usefulness of the example here. Because I think that a strong argument can be made that the members of the OWS movement (or at least a significant portion of the members) are also going about trying to secure rights in the wrong way. The obvious example are the masked vandals in Oakland that Ghân references (and who were active long before the general strike protest, Ghân, and who's actions along with those of the police and other TPTB directly led to Scott Olsen's injury). But I need look no further than the Occupy Santa Cruz encampment. No, they are not violent (thank Eru!), but they are dirty, a health hazard and generally off-putting to many of the people that would and should be there allies. As long as that is the case, the movement is not going to go anywhere in the long run.
Like River, and based on personal experience (see earlier post referencing agent provocatuers), I am skeptical of violent elements at and before OWS. It is interesting to note the amount of play reports of violence have recieved in comparison to the overal action.
Regardless, I agree on the point about the general lack of appeal of joining the occupyers. Though officially homeless again, I have no desire to join them as long as clean accomodation remains on offer. It didn't make me popular but I actually addressed this very issue at a workshop for social justice advocates.
Of course depending on means, some people cannot help their lack of hygene or appearance, nor even the unsanitary conditions they live in. For those who have a choice, choosing to add to the mess that overcrowding and lack of sanitation produce, I wonder if it is seen as a way of trying to force authorities to take action? Or perhaps it is an act of submission to the kind of humiliation and suffering such conditions might also produce?
I think they are doing it this way because occupying buildings for shorter lengths of time often leads to immediate violent reprisal. That and occupying a lobby, suite of offices, or even an abandoned building is far less visible but percieved as far more threatening.