The "Ralph Nader" illusion is a quintessential liberal illusion, and as such must be seen for what it really is.
Nader's goal is to reform our capitalist society, to have fettered capitalism instead of unfettered capitalism, to have capitalism with some protections for the working class such as single payer health care and a higher minimum wage. This goal will leave unchanged the root cause of our many problems.
The root cause is that our society is based on class inequality. It is based on the principle that there should be two very different classes of people.