What made you exclude them to begin with? Oh right, the fact that I included them, and that is really all it took for you to add them to your exclusion list. That and knowing they didn't have any ability to ding you back with their own exclusion, and no one would ever notice.
Repeating it ad nauseam doesn't make it true. At most it provides an insight into how your "logic" works. I don't go through other people's trust lists to find someone to exclude but you on the other hand...
I was looking through Suchmoon's distrust list
Shall we conclude that you were looking for users to include?

But I guess it's one of those magic one-way things.