The ecosystem of the company is what creates the immoral behavior. It's the combination of the management, shareholder expectations, etc.

If the shareholders are lax in demanding moral behavior, then immoral behavior will result. The company should absolutely be shut down.

> Otherwise, they'll just join other companies or start new ones and continue to do evil

Actually, nobody will want to hire them. After all, nobody wants to lose their money in a company that was shut down.