The money is supposed to be invested in part by the employee and the employer at the time of payroll. This money is then moved to a fund, impossible to be touched by the company forever and ever. The fund invests the money, it grows, and then you can get an income in retirement after many years. The same could be done by the employee itself by just saving part of his paycheck and investing in a mutual fund, but most people don't have the discipline to do that so a defined-benefit pension protect the employee from itself.

That's how it works in other countries like Canada. It's relatively easy and failsafe if well implemented, I really don't understand how it can be legal for a company to access the fund like in the story.

It's a shame so many of them are so badly managed/corrupted though. As usual, most stories about pension failing are about gross mismanagement (not paying into the plan as required) or corruption (drawing into the plan innapropriatly).