Their obviously wasn't much thought put in to this. Anywhere that a conflict of interest occurs has potential for abuse. If the officer/employee/agent has the ability to influence the result and profit then their is a conflict of interest. The legal ramifications are lessened and the cost to benefit subsequently decreases.

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.