While I agree with you that publishing a picture of a person without their consent ought to be illegal, I as an individual with very unreliable memory and one who’s always doubting my perception of reality, I heavily rely on modern technology and strongly believe that personal recording of any kind is my right, it being simple augmentation of my senses that allows me to live happier and more fulfilled life.
Making it illegal is a few steps too far. It leads to situations where you can end up doing more harm than good. In reality this is is a very complicated question and any attempt at "solving" it with absolutes will only complicate matters further.
Here's an exercise you can do. Go to a library and look at books by photo journalists who have covered poverty, conflict, disaster etc. There are many, many iconic photographs that helped shape our view of the world, and not least, contributed to making us aware of what was going on. From Dorothea Lange's work in the 1920s covering poverty and suffering in the US, to photographers covering everyday life, and reporters covering anytihing from famine to war.
Now ask yourself how many of the subjects in those photos signed releases or otherwise had an opportunity to give consent.
Should we erase this history? If not, why should the subjects in those photos have fewer rights than people should have today? If so, why?
Before you think that something should be illegal you have to think about what that would actually mean.
