I think the multiple source evidence of at least the massacre happened. In fact on the 10th year anniversary there were many shows about it from all different points of views. The Dutch peacekeepers who eventually surrendered (and shamelessly were allowed to leave, while those who they had offered refuge to were taken and killed) were among the most disturbing.
All in all the main lesson I take from it is that gun control is a prerequisite for genocide. But thinking people new that already.