Kierkegaard's first book was titled (in Danish) Enten -- Eller (1843), translated into English as Either/Or. But that book is not about either/or thinking; rather, it is about living either the aesthetic/ethical life or the religious life.
It is interesting that Kierkegaard, who wrote Either/Or, is the philosopher/theologian who most widely used the concept, and the word, paradox in his serious writings. I know he used that word a lot, for my doctoral dissertation was "The Meaning of Paradox: A Study of the Use of the Word 'Paradox' in Contemporary Theological and Philosophical Writings with Special Reference to Søren Kierkegaard."
Paradox is very much about both/and thinking, and in general I heartily espouse that kind of thinking over either/or thinking, as was DHJ in his comments.
There are situations, though, in which both/and is not a possibility. We must choose either/or. Where we stand on issues of aggression, oppression, discrimination, and the like are of the latter type. It has been said that one is either on the side of the oppressor or the side of the oppressed. That is most probably true. Some fences can't be straddled.
By what he wrote in his comments on my blog postings and said in our discussion at lunch last week, Chris Thompson seemed to think I was "aiding and abetting" (not his words) the oppressors in my second and third postings about Columbus. That was not my intention. If that seemed to be what I was saying, I apologize.
I want always to be on the side of the oppressed and not on the side of the oppressor. In many ways, though, I probably am on the side of the oppressor just by being a white American male. But that is the way I was born, not a choice I made.
I did choose, though, to be a follower of Jesus, and as such I want to live, and I try to live as much as possible, in solidarity with those who are oppressed, including the Native Americans who have been grossly mistreated in multifarious ways since the time of Columbus.