Ethanol as fuel provides a case study:
Ethanol Fraud and Why You Pay More at the Pump
It starts as mere cronyism, and ends up as Fascism - the ultimate public-private partnership. The partners will beggar consumers (and tax them for the privilege), pollute the air and water, install protectionist tariffs and stifle innovation and competition with arcane and draconian regulation.
When this is rolling along nicely, they create an unnecessary and inefficient market to
Conservatives (who used to be called liberals) believe all people are imperfect and subject to the temptations of power. Therefore, they seek to limit the application of power.
Progressives (who are now called liberals) believe all people, except those in power, are imperfect, and that the temptations of power are trumped by good intentions. They seek to maximize the application of their intentions - no matter the results.
Note: The article linked above repeats itself, so when you reach the part you've already read, you can stop.