The way I’m reading your question, it seems like you are looking for the law to follow philosophically consistent principles.
That is simply not the case and lawmakers can make any kind of law to shape the society how we wish. If leveraged buyouts are creating problems for the country, then it’s totally valid to make them illegal in certain cases.
The question I'm asking is: what problem? If a bank takes a risk and that risk doesn't pay off how exactly is that society's problem?
And yes, I do think laws should be based on consistent principles. I'm surprised you consider that a controversial point...