OK, so you're just speculating. Thank you.
There's no speculation there that I can see. Enron employees were already getting the company match entirely in Enron stock. They had no choice about that.
Assuming most employees only contributed what the company did, they were already overly invested in one stock, i.e., 50% of the account was in Enron, which is ridiculously overconcentrated.
But many used their contributions to make that lack of diversification worse by using their contributions to buy even more Enron stock.
They did that either out of greed (Enron stock was appreciating dramatically as the chart on this thread shows) or they did it because Ken Lay and others in Enron management were encouraging that, and they didn't know any better.
However, it did violate the cardinal rule of investing large sums of money. Don't put it all in one particular investment.
There's nothing speculative about noting that.