Boeing employs millions (mostly indirectly via downstream cottage industries) of people and I think is the leading net exporter by revenue of the US. Politicians don’t want to hurt them too badly because all those employees vote.
That's why you limit the liability of the company as a whole, but create great risk for the actual executives who decided that safety came second to the profit margin. Again, you can imagine what that would be, but when you compensation is in the tens of millions and there are hundreds dead, well... the risk has overcome the reward and the punishment should match.
Boeing's problem is its management. If you tell the rank-and-file worker to use the company's billions of dollars worth of production capital to build a quality airplane and hold them to it, they've shown they have the ability to do so in the past.
