Four arrests in two nights isn’t terribly much. Murdoc’s guess is that they’re either not terribly serious about it, or that there are so few of them that it’s difficult to reach a critical mass. Or maybe there are so few that they cannot afford to get everyone arrested right away. Probably a bit of all of them.
I haven’t seen any wide-angle pics of the protest crowd. Again, probably because there are relatively few of them. That’s what the rather lame video from the first night’s protest seems to indicate.