that there is no evidence of bad policing. could also be police brutality. Who knows. Either way, showing an activist getting arrested doesn't really mean: "bad policing", unless the photo shows something that really wouldn't be appropriate no matter WHAT the activist could have done.
For example, shoving a police baton up his ass.
Aside from that, it's hard to say the police were 'randomly arresting innocent people for no reason'.
-mike