I think the reason it will go deadly is because of all the trash, rats, and filth. Lord knows if any new type of super viruses are in the works. Let alone bringing about old ones again with their ill gotten ways.
The sad fact is simply this: They indeed pose a threat to the kind, and decent general public in places. Whether it is threat to physical wellbeing when they finally realize they are going down, not getting what they want, being laughed at, etc circa any other "shiny, happy people" protest these hippie a-holes have tried to get going, or whether it is a threat to the body. Airbourne illness, different or possibly new types of flu, Zucotti lung disease, etc.
Not really fear mongering here, but these people are somewhat dangerous animals either way you choose to look at it. The people that basically said "Screw it, I'll support them from myk warm abode are one thing. (Nads, I'm looking at you) However, the people that are still out there in their little Tent Cities among the rats....they are the real nutbags, and like I said, are a threat either way you slice it.