Yes he committed fraud, not murder or child molestation. He hurt many people. There were plenty of good hard working people at Enron, who lost everything they had becuase they couldn't sell when the prices started going down. Lay sacrificed the retirement and financial security of thousands of his employees and their families, so that he could buy another vacation home and continue his affluent life style.
I have no problem with someone making a lot of money. If they earn it good for them. Ken Lay didn't earn his fortune, he stole it from his employees.
Lay deserved to spend the rest of his natural life in prison.