It's to protect the middle class of course, though one can only wonder why the blatant double standard. I have no idea!
The "accredited investor" regulations are a sham, an unfair and artificial barrier to entry that ought to be removed. Yes, some people will get abused. This might even create local instability. But, that is clearly the long-term optima. Those who lose money to scams can leave it to law enforcement to do their job. Others who invest more they can afford to lose into bad apples will learn that you should always hedge risk. As a whole, society gets smarter when it is allowed to make mistakes, even costly ones. Smarter and less fragile.