In case you didn't notice, these industries have serious flaws (caused by many things we won't get into here), that leverage magnifies.
Besides, there's still no legal basis for llcs, just convention.
That's what leverage does: it magnifies. That doesn't mean that these industries are inherently bad. We need a strong banking system and a strong real estate industry.
And what do you mean about no legal basis for LLCs? I'm pretty sure every state has a legal basis for LLCs.