The crux of the matter here is why people react so negatively to being recorded on video. You seem to believe it is because the person doing the recording might attack or ask for money. I don't really buy this argument, since being asked for money is not really threatening, and there are so few people who turn violent randomly that it is not something one would assume immediately of strangers.
Most likely, the reason people become angry when recorded is due to a privacy concern since they do not know what the recorder will do with the video. In this case, I think this guy does make a valid point. There is no way to tell what will happen to surveillance camera footage. Yes, theoretically it should only be used in special circumstances, but until it is codified into law, and even if it is, there's really no guarantee.
I do not see why we cannot blame the law. The argument seems pretty trivial to make. If a company does not overreact they have a low chance of being hit with a very large penalty (loss of safe haven and lawsuit), whereas if they overreact they have a high chance of facing a small penalty (loss of some customers and some bad publicity). The logical decision for any business would be to take a high chance of a small penalty over a low chance of a high penalty, to maintain stability. So the law here is systematically encouraging businesses to overreact, which seems like a bad law to me.
The "Lighten Up" situation is quite different in that there was an identifiable victim of the sexism who suffered concrete consequences such as being forced to attend an HR meeting. "Every woman in CS" is too broad to establish an identifiable victim and "this makes me angry" is not a concrete consequence.
Most likely, the reason people become angry when recorded is due to a privacy concern since they do not know what the recorder will do with the video. In this case, I think this guy does make a valid point. There is no way to tell what will happen to surveillance camera footage. Yes, theoretically it should only be used in special circumstances, but until it is codified into law, and even if it is, there's really no guarantee.