the need for constant vigilance (regulation) of our Capitalism. The recent experience with our "Great Recession" also shows what can happen when Capitalism is un-checked...and if you read the book entitled "Tyranny, Inc." (written by a Conservative Influencer), it'll bring the economic system's foibles home to your doorstep.
All that being said, Democrats still stand in favor of Capitalism, while at the same time making sure that it serves ALL Americans...Fairly...some call it a dose of Socialism...not Communism.