You're right it can be recognized as a subjective idea, but I think a good portion of the world does not think of it in that way, specifically other main world religions. I would prefer that the UUA did not represent me in making that statement.
I agree; many of the things considered "evil" by other religions are not by any means evil in my book... they may be wrong in relation to certain things (such as detrimental to society or to an individual) but I can't really think of ANYTHING I consider OBJECTIVELY evil.
But here is the full quote from the uua.org website: "The living tradition which we share draws from many sources:
... Words and deeds of prophetic women and men which challenge us to confront powers and structures of evil with justice, compassion, and the transforming power of love..." This, to me, sounds like it encourages social responsibility and peaceful solutions to problems ("evils").
Getting this back on topic
, I think more people are ATTRACTED to statements such as this within the UU church than against it (though, for course, there are those who are going to be of differing opinions... we're Unitarian Universalists!) I think the UU Principles and Purposes has brought many people TO the church rather than scaring them away; I know this is why my parents came. They thought it put forth good social values while allowing them (and us children) to explore their own spirituality.
But many people who would normally be attracted to the UU church but who also look at everything as sets of subjective (rather than objective) truths might actually be pushed AWAY when they read the UU Principles and Purposes, because some of the statements it makes assumes that there are universal truths (which I don't really think there are, at least not about moral issues).