please could you link to some sort of evidence of that? i dont disbelieve you but i would like some sort of documentation of this 'model release' element of the law... i can understand why model release forms are a good thing to have if you are using a studio or something like that, but what about if you just take a beautiful photo of someone and a company decides to buy it? Or you decide to sell prints of it? Does the law state you need a model release form for this? Or would there be repecussions where the law is not on your side?
A Model Release Form has no legal status as such; it is just evidence. But if one has been signed, openly, honestly and fairly (that is the main potential loophole, or something along those lines) then it is hard for anyone to complain too much.
The Moral Law you are referring to, and have outlined, is something quite different to the wider moral principles being discussed.
If you are seeking a legal right to publish a person's image simply because you don't have their specific permission, then in most situations you probably have it. But the context and circumstances vary so much then it is possible to fall foul of all sorts of other offences. It's just that Copyright will not be one of them. You have to follow your own moral compass and judgement on that one.
Publishers are very wary of this, which is why they usually request a Model Release, not as a permission, but as an insurance policy.
The bottom line is that if you don't upset anyone, for example by defaming them unfairly, or exploiting them unreasonably, or just generally taking advantage for your personal gain (financial or otherwise) at their expense, then regardless of the legal position, you need to question the moral situation.
When people get upset - rightly or wrongly, for legal reasons or not - just an exchange of solicitor's letters telling them to bu99er off will cost a few hundred quid. This is why publishers like Alamay require certain safeguards, and why clients will always select an image supported by a Model Release over one without. It's not a legal requirement, it's just good business practise and common sense.
And it can be very difficult to predict when folks are going to be upset. For example, I am aware of a photo of an attractive Asian girl that was widely published. She was at a public car event with her boyfriend, smiling at the camera, having fun. I guess she had no idea it would end up in a major magazine. She had not signed a Model Release.
But her father saw it and was not best pleased. He claimed it had ruined her arranged marriage to another man, brought huge shame on the family etc etc. I think the family's distress was genuine and even though I don't subscribe to their point of view, that was not the issue: harm had been done. Regrettably for the father, absolutely no laws had been broken either, so that was that. However, the magazine's policy of publishing photos without a Model Release was tightened up after that, not for fear of legal consequences, but because they didn't want to upset anybody for whatever reason.