I don't know much about the Sudanese situation, but isn't one of the reasons the boycott of Israeli academics is justified, the fact that Israel is supposed to be a democracy and therefore its government and its actions, ultimately the responsibility of the electorate? In Sudan, there's no illusion of democracy and so no similar freedom to act (and so responsibility to do so) on the part of its academics.
--
- - -
Sam Hardy
DPhil candidate
University of Sussex
Placing cultural rights: resolving conflicts over cultural heritage - querying cultures' rights and archaeologists' responsibilities
http://human-rights-archaeology.blogspot.com