"There is a tendency, however, where many evidentiary incidents or items are introduced to be carried away by them and to treat each of the allegations, incidents or items as if they were themselves the subject of a complaint. In the present case it was necessary for the Tribunal to find the primary facts about those allegations. It was not, however, necessary for the Tribunal to ask itself in relation to each such incident or item, whether it was itself explicable on "racial grounds" or on other grounds. That is a misapprehension about the nature and purpose of evidentiary facts. The function of the Tribunal is to find the primary facts from which they will be asked to draw inferences and then for the Tribunal to look at the totality of those facts (including the Respondent's explanations) in order to see whether it is legitimate to infer that the acts or decisions complained of in the originating applications were on "racial grounds"