A conundrum

This came up today in the course of conversation.
Situation: There's a problem between 2 parties. A wants something from B.Money and information being the top condenders on this one. A will continue to contact B until the issue is resolved, but B steadfastly ignores all communication even though the easier path is to give in and DO it already. A doesn't want blood, afterall. Or do they?? The Red Cross are a tricky bunch.
Would someone like to wade in with theories as to why B chooses this less comfortable path?