I don't care that this was published more than 5 years ago--this is the best explanation of why having a perfect plan or solution does not lead to a perfect outcome that I've ever heard. Here's the best paragraph:
"Thomas Sowell likes to say that reality is not optional. But we oh so want it to be. We want to change outcomes without consequences with the ease of adjusting the thermostat on the wall of our house. We want to dial incomes upward and gasoline prices downward. We want to blame Wal-Mart for the fact that its employees earn below the national average. We want to blame China (or Mexico or Japan or India) for our trade deficit. We want to blame or honor the occupant of the White House for whether new jobs are high-paying or low-paying. This worldview that flies in the face of reality and that ignores the inherent complexity of the real world is the bread-and-butter of journalism and the breeding ground for unintended consequences. "
Find it here: Russell Roberts "The Reality of Markets"
Read this one too: Russell Roberts "Pigs Don't Fly: The Economic Way of Thinking About Politics"