In the example I mentioned where the only footage of violence against me by persons is controlled by the persons themselves, what does it matter if it gets sent to S3 with immutability for 10 years? I still can't get that data if they don't want me to, in some countries the legal discovery process might _say_ all parties in a legal dispute must comply with the discovery process, but if one of the parties states they simply don't have the data, the courts can't do much of anything in such cases.
(The following statement is not to decry encryption, but more just to show that "deletion" is just an example there are many ways to "lose" such surveillance)
What if instead of deleting, we said "could not accesses, whoopsiekittens"? Let's say they do send the data to a centralized storage center, and naturally, they're encrypting all the data they send as per best practices? What exactly would I or anyone in my situation be able to do if the company "lost" the encryption key? Or they retrieve the data, muck a bit with the file to make it unreadable, and then just say "welp, guess just bad luck here"?
Unless it's _all open and all accessible_, it just means that those with the surveillance data have the power to use it however they want. Their excuses may be disprovable over time, but how long do you think most reasonable people would believe me if I tried to convince them that every excuse created was an intentional deception? How could I even prove it in most cases?
I am not advocating for non-stop surveillance and full open access to that surveillance to be clear; I have not thought what a system like that would look like and I am not able to say how it could work "for everyone", nor do I think it really could.
That's not the point, the point is instead that no matter how it's stored, unless everyone has equal access to it, it's still is surveillance that only those who control the surveillance data can use, regardless of what they decide to use it for. Body Cams for police in the US are a perfect example of this -- theoretically, they're for the public to use and for accountability with police, but since the police control the body cam footage and even get to decide that they don't _need_ the body cams at times, it's effectively surveillance that works for them when they want it to, and can be hidden when it works against them.