This is the best article I have read regarding why we need Medicare for all:
"According to Dr. Geyman, “The ACA’s fundamental flaw is that it props up an inefficient and exploitative private health insurance industry while not recognizing that deregulated markets can’t fix systemic problems of access, costs, quality, equity, accountability and sustainability.” In Dr. Geyman’s view, this flows from the political fact that the Affordable Care Act (ACA) was “crafted in large part by corporate stakeholders who are themselves responsible for the high costs of U.S. health care.”
Full article:
http://www.helpingyoucare.com/24844/would-medicare-for-all-be-the-answer-for-our-health-care-system