Investment banks hire risk takers

This article explains the difference between commercial and investment banking. There was a law in USA called the Glass-Stegall Act that required them to be separated. It was a good and sensible law, which was unfortunately repealled.

Risk taking is the same as gambling. When you bet in a casino, you are taking a speculative risk. When you trade stocks or currencies, you are also gambling. It makes no difference whether you gamble in a casino or work in the trading desk of an investment bank. There should be a law against banks engaging in gambling!