Whitaker-Chavez was a big event and bad decision, but not THAT bad. I've seen way worse miscarriages of justice in boxing.
I don't see why RJJ and Calzaghe would have to weigh in again. If they are under 168 they must be under 175.
Billy Collins vs. Luis Resto comes to mind when I think of travesties in boxing. Gosh there I go with the Irish again (personal reasons. Can't seem to get them out of my head) The old Mob influence was also a travesty. Ali being stripped of the title because of his refusal to be inducted (there I go with the Irish again). Joe Louis and how he was treated ranked up there too. Roy Jones being robbed of a gold medal. Mike Weaver being stripped of his title for no clear reason other than doing the rope-a-dope. Blacks being denied at early title shots because they were Black.