shell companies are just companies, suppose the vast majority of which are formed for perfectly normal reasons,
If they can have "free speech" and are "legal persons" then the public _surely_ has an interest in knowing who is benefiting (the ultimate beneficial owner) from that corporation's actions.
If sleeping with someone was a taxable event, would that mean that it's OK to spy on people's bedrooms? After all, it's in the public interest.
In principle, I think that taxing only land ownership and pollution is the theoretically fair way to do taxation. And land ownership doesn't require obtaining any data that isn't necessarily known by the government in the first place.
It would be immoral to make sleeping with someone a taxable event. And therefore immoral to treat it as a taxable event.
Would it be in the public interest that their identities were revealed and the lot be killed by the King ?