Risky Investments by US Bank Ethical?

Insurer Woodmen files $30M lawsuit against US Bank

Woodmen of the World is filing suit against the US Bank as they invested money into risky investments when they told the Woodmen that they would invest in stable conservative investments. I believe that Woodmen have a case of unethical practices as it is apparent that the Bank might of invested riskier to take a larger margin off the top. However if the stipulations of the evidence aren’t in the contract then it is not binding and they will have a hard time proving their case in US court of law. In a principal-agent contract if the agent acts in their given duty and acts responsible to the best of their knowledge they cannot be help negligible. Woodmen of the World are trying to sure for $30M. Any opinions on the possible outcomes of the case?