In the context of your examples, I understand what you're saying.
However, we can't rule out the fact that a decision of general application can indirectly grow someone's assets. Even if a law is not based on a single scenario, there is always an extraordinary scenario. An individual became Prime Minister when he was the head of Brookfield. That firm controls the assets of 900 companies, with $1 trillion in total assets. The first thing he does when he comes to power is say that we need to rebuild the Canadian economy. He then launches major projects in the five areas in which this firm has an interest.
Doesn't this case constitute a perceived conflict of interest?
I'm not talking about a minister; I'm talking about the Prime Minister. He himself will sanction his ministers and exercise his responsibilities to contain a perceived conflict of interest. Here we're talking about the Prime Minister, the person who has the opportunity to direct all economic policies. He decides to go full steam ahead on projects that may see the light of day in eight years. You were also talking about Mr. Trump, but he'll be dead and buried by then.
To restore people's faith, don't you think it's important to recognize that these general interest decisions, which may be useful or good for certain sectors of the economy, will also favour the firm in question?
Furthermore, just because assets are in a blind trust does not mean a person doesn't know by how much they stand to grow. They know they're going to grow, and that's a perceived conflict of interest.