Losing a job is traumatic. Enron though, wasn't about insider trading. Yes several of the guys at the top were charged with insider trading, but they were also charged with fraud, money laundering, conspiracy, bank fraud, making false statements to banks and auditors, securities fraud, wire fraud, money laundering, obstruction of justice, among other crimes. Insider trading, not the thing that caused trauma, and in fact I believe most of them were actually acquitted on the insider trading charges. And, fwiw, the guys found guilty of these things did end up with significant prison terms for the trauma they caused.
So despite listing all the extreme damage they did, you still think it is reasonable that they got "significant" prison terms and the guy who stole a wallet gets life?
You just suggested that Enron was insider trading so I don't think you have a great handle on what insider trading is. It is not traumatic for someone to enter into a stock trade that they are planning to make. The fact that the person on the other end might know more than you is a fact of life for every stock trade ever made. There are prominent economists that think we should let people insider trade. It is a victimless crime.
When the whole Enron thing went down a few years back, my flatmate at the time lost her job, as an accountant in the UK as a result of that.