"Private parties" are mighty multinational enterprises with essentially limitless pockets, entities whose factual power and political influence rivals most governments. Countries all over the world have been struggling to restrain them for the past decade in order to keep their sovereignty.
What exact "interests and ideas" do you have that would involve the necessity for public facial recognition? Because I, for one, don't want my biometric data in your system without my explicit consent.
"Private parties" refer to non-governmental entities, such as individuals or businesses. You may be acting on a governments behalf, but I am not.
> I, for one, don't want my biometric data in your system without my explicit consent.
If it's a single individual watching (for example) the sidewalk in front of his house and not disseminating the data in any way then what does it matter? Where is the potential downside? There are plenty of neighborhoods with at least a few retirees sitting staring out the front window for multiple hours each day.
As far as I can tell in the vast majority of cases surveillance only becomes problematic when both ubiquitous and centralized.