What it boils down too is STRESS. aka Karma got him in the end.
Now people talk about how much he ripped people off but to get down to the nitty gritty in reguards to the Enron stock a lot of people were greedy and were loaded up in that stock because it was returning a very high dividend and the stock kept going up.
http://news.bbc.co.uk/2/hi/business/1759599.stm No way that the stock should have passed $80 a share on even it's cooked numbers but greed made people blind until it turned out to be a house of cards and the people just acted like there was no way for it to be true. HECK some of the people who lost the most were the ones who knew the inner workings of the company and if they had just sat back for a minute and thought through what was going on they would have covered themselves from losing so much. While in relation to the other pension plans that invested in Enron Stock their people are paid big $ to dig into the books and see if anything looks unkosher and they should have smelled something stinking real bad and cut back or sell off their positions but the returns were so high they were blind too. Not saying what Enron's officers did was cool or anything but they were not the best in covering everything up that they were doing. Indications are now a few years later that dozens if not close to a hundred people knew that things were being cooked and it is hard to keep that many people on the same page to where they don't spill the beans.
One thing that Enron brought to the forerfront was the lax auditing work that Arthur Anderson was doing, they were just as guilty as the Enron Executives on ripping people off and hiding things.
I will say one great thing came out of Enron's activities and that was the sore butt that California received from the Energy Traders at the big E. Now that was funny!
Now that Lay is dead he saved the taxpayer the costs of the rest of his prosecution.