The job of the police is arresting people who break the law, but similarly to your money manager, you really don't want them to do this regardless of anything else, there is more things to consider than just "do everything you can to arrest people", and hopefully the same for your money manager. But also, I might be too European to understand the true value of "money grow regardless of society cost at large".
In a good system both sides fight for their interests, and the outcome is some middle road compromise that optimizes for everyone's benefit.
This leaves room for individuals to act in accordance with their morals above and beyond the law.