Howard Zinn in Declarations of Independence

“Those of us who call for the repudiation of massive violence to solve human problems must sound utopian, romantic. So did those who demanded the end of slavery. But utopian ideas do become realistic at certain points in history, when the moral power of an idea mobilizes large numbers of people in its support. This may then be joined to the realization, by at least some of those in authority, that it would be realistic for them to change their policy, even perhaps share power with those they have long controlled.”