Auditors are a good example. They have privileged information and are responsible for the fairness of financial information / disclosure. Their incentives are already complicated by the compensation structure, i.e. the company they attest for pays their fee and ultimately decides whether they will work together in the future.
In this instance, an abolishment to insider trading regulation would ultimately undermine trust in the financial reporting system. The auditors could potentially place bets on their engagements and negotiate results based on their interests. Impartiality would be compromised. There are safeguards in place currently, penalties for insider trading are part of the remedy.
This is a very odd straw man.
What you are describing would still be a crime in a world in which insider trading is legal.
I think you are the one who didn’t put much thought into this.
In practice. The world is unfair, and retail investors must compete against all kinds of people with unfair advantages.
If insiders could legally trade, then the ability to profit off insider trading would go down.
The argument that insider trading should be banned because it is somehow disproportionately unfair is quite weak, the argument that it creates an impression of unfairness is a much stronger one.
I personally don’t believe it is a particularly good argument, but it is certainly the strongest version of the argument against insider trading.