That really is the $64 question- from the hostility evinced by their slogans, I'd guess few have ever worked for a living, and are sorts of parasites collecting grants, welfare, or other types of support.
If you could track the money, you would find who really lies behind this "anti" movement.
I can tell you this- they are no friends of America, Israel, business in general, or freedom.
Add to this their puppets suck.