If this email had actually been sent down by a shakedown attorney, there would be absolutely no recourse. But the sender is part of an institution that admits outside criticism, and so there is an angle to strike back. Regardless of the research ethics here, it seems most of the outrage is precisely because
this perp has a chance to be held accountable.
The real overarching problem is that anyone can be subject to life-altering lawsuits through the legal system, which will cost unreasonable amounts of time, money, and personal sanity. There's no hope for justice for small time actors, since the damage has been dealt out before ever seeing an informed decision by a judge. And even if you can invest enough to pay for a real judgement, the chance of getting awarded legal fees is slim, never mind rewards for lost time and emotional distress!
I don't think the problem is specifically the CCPA, since it does except small time actors. Rather the setup for the problem is a heavyweight legal system, draconian laws that do apply to individual actors, and the massive fan out caused by being globally connected. Anybody is basically one doxxing away from a barrage of legal demands, and our poor technical architectures basically guarantee anybody who puts themselves out there even slightly can be doxxed.
I don't know that there is a straightforward fix. The dynamics have been explored to death, and we seem to be trapped in this state because the real beneficiaries of the legal system (well-funded corporations and other professional actors) are happy to keep it this way. But this situation is a lightning rod that illustrates how outrage over it is growing. If it continues to not be reformed, eventually something is going to break catastrophically.