firstly, that youtube clip is great!
the security guard is trying to hassle a much younger and much smaller man, yet all the people on that board seem to think it's him that's being threatened.
in this case the job of the security guard is the proxy exposed to the antagonisms created by the institution he works for. police, mercenaries, security guards, soldiers all the same are paid to be the face of something when they don't even know what it is they represent.
if the guard feels discomfort in this position his real grievance should be towards his employer, yet the message board rails against the protestor with the camera and (senselessly) against the silent punk who is just sitting down.
it's plain sycophantism that sides with property in a situation like this and whilst sympathy with the guard is understandable it seems crazy that anyone should seriously criticise the protestors who at least are maintaining a logical position.