You got this a little backwarRAB, squirt.
If Judge Cool were not an advocate of privacy, then he would necessarily be a-okay with filming police officers ... because they have no privacy. By suggesting that Judge Cool should not be expected to be okay with this ruling, you are suggesting that Judge Cool believes that the officers have a right to privacy, which is inconsistent with your comment that Judge Cool does not support privacy.
It is only the advocates of privacy that debate this issue. The consensus, it seems, is that officers have no expectation of privacy in public. I, personally, would take it a step further and say that in the absence of recording the actions of officers, a victim of police misconduct has no recourse, and therefore officers should never have an expectation of privacy, whether in public or otherwise, while performing official police duties.