I think her message is both wonderful and true: Optimism is a great survival strategy. And I agree that music is a place to escape to for a "better world".
The sad fact is that there are monsters among us who feast on hate and suffering. The legal system of civilization usually keeps them at bay, but not always. I look at the US today where so many fools agitate to "downsize government" because they see no value in it. They need to remember the insights on Thomas Hobbes:
Hobbes postulates what life would be like without government, a condition which he calls the state of nature. In that state, each person would have a right, or license, to everything in the world. This, Hobbes argues, would lead to a "war of all against all" (bellum omnium contra omnes), and thus lives that are "solitary, poor, nasty, brutish, and short" (xiii).