Because investments are still a great way to hold your savings. The problem here isn't that they have investments (e.g. a 401k), it is that they are acting on insider information. Which is illegal to everyone else. At _minimum_ they should be held to the same standards. Though I think most people agree that they should be held to _higher_ standards, which gives suggestions like a blind trust. And obviously strict rules of if they break the blind part that they get jail time.