Operations Management homework help

We are going to do a 4-page research-based project on online privacy as the overall topic.  There have been a number of privacy issues and breaches that should highlight this for all of us as employees and consumers.
The question is “Why Suppliers (stakeholder) NOT the most responsible for protecting consumer financial data (data breaches) in an online clothing retail store?  What  stakeholder IS the most responsible for protecting that data(data breaches)?”