Why is that if I exclude personal expenses before paying taxes I get jail time, but if I'm a corporation, not only I can do exactly this, IRS will pay me if my

Why is that if I exclude personal expenses before paying taxes I get jail time, but if I'm a corporation, not only I can do exactly this, IRS will pay me if my expenses had exceeded profits? And how does it square with the claim that corporations are people, legally speaking? Why do I go to jail for insider trading, but gov officials can exempt themselves from the law and do insider trading "legally"? Why is working for multiple employers is a contract breach, punishable by law, but board members can sit on multiple competing boards? Why bribing city officials to direct funds to my pocket company is a crime, but senior execs can have buddies and family members in high rank gov positions that directly affect the business the exec's company? Because the law is often just a written expression of the will of those who has power over those who doesn't.