Using white phosphorus in a densely populated area is bannend by international law. Doing it anyway is no war crime?? Destroying basic infrastructure like sewage plants and not allowing any building materials into gaza to fix it for almost a year now (so that the huge aquifer - and thus the drinking water- under the strip will be poisoned for decades if nothing is done about it really really soon) is no crime against humanity?? The UN report is not about if there was a reason for that war - it's about crimes against the normal population that have been conducted during that war!
from the article: Netanyahu calls UN Gaza probe a 'kangaroo court' against Israel