Saints upset people. It is surely impossible to live a life of heroic virtue without igniting the wrath of the wicked. Even the relatively good may be angered by holy obduracy.
Unfortunately the canonisation process itself can and has upset people as well. For example, have political considerations entered the holy calculations more than they used to? And does their weight vary from one papacy to the next, as it clearly did in the case of St Oscar Romero? Would the Congregation for the Causes of Saints be inclined to push on with the cause of a traditional Catholic in a country where Islam is the official religion?
