...Becuase even the stock market companies are under the regulation, there is lots of scam incidents in stock market You could found some by searching in Google Enron(around $60billion) in 2001, Bernie Madoff’s Ponzi scheme( $65 billion) in 2008, Wirecard 2 billion etc.
You're wrong. Bernie Madoff's campaign did not have any shares and therefore they were not listed on the stock market. It was a common ponzi scheme, when clients gave their money to a fraudster at a high percentage, and due to which the first "investors" received a good profit.
If we take the stock market as a whole, then I would not consider investing in
campaignscompanies that are not American, since the legislation of not all countries provides for
campaign bankruptcy insurance
if the shares were purchased through a broker.