There is no conspiracy theory.
Charles was caught meddling in politics using his position to influence ministers and senior civil servants. He was caught by the guardian via a freedom of information act request. What was the royal response, remorse? Nope, they said nothing and then had the law changed to ensure their communications were exempt from freedom of information. If that isn't an admission that they will continue meddling then I'm not sure what is.
Next we had the guardian finding that more than 1,000laws have been meddled with by the queen in her reign. Even 1 law is too much, but 1,000+ times they used the queens approval to meddle!
The above is a matter of public record, not conjecture, not conspiracy, its fact and absolute proof that the royals are political meddlers.