Corporations don't lend or not lend on philosophical grounds.  They analyse the risk and lend based on the risk profile and the return on investment.

Desjardins is simply realising that the risk outweighs the return.

You only have to look to the Lac Megentic disaster to understand why.  The railway that caused the problem, was a wholly owned Canadian subsidiary of an American corporation.  This corporate structure was designed to protect the US investors from a disaster such as the one that occurred in Lac Megentic, with the Canadian subsidiary declaring bankruptcy, and the US parent corporation taking the assets and profits back to the US for their shareholders.  In the end, Harper quietly paid $100m Canadian tax dollars to clean the tragedy up.

 KM Canada is designed in exactly the same manner, for exactly the same purpose; to protect US investors in the event of a Canadian disaster.  Desjardins appears to believe that a loan to the Canadian KM is high risk.

Stop the KM pipeline.