There is a reason it’s called a limited liability company. People who do business with a limited liability company are on notice that they are relying only on the assets of the company. If they are not willing to take that risk they need to get a personal guaranty from your rich guy. The whole business world understands this. Some folks gamble and lose.
I personally know a rich businessman (he's been my boss for some fifty odd years) who started such an LLC, in addition to his other businesses. It failed. What did he do? He paid off all the creditors, hired the employees in his other businesses, and closed the shop. It was the right thing to do.
It is simply a fact that Trump could have done the same. He may have only $8 billion, instead of $10 billion, but to me, what he did was not right.