Edit: I was wrong

How is the Pope making official statements ("defines a doctrine concerning faith or morals" pretty much sums up all pontifical statements that aren't a direct response to world events) concerning faith/morals which is destined to catholics anything "rare"?

BTW you paraphrased in a way that makes it less legible (IMO), here is the original:

[...] when the Roman pontiff speaks EX CATHEDRA, that is, when, in the exercise of his office as shepherd and teacher of all Christians, in virtue of his supreme apostolic authority, he defines a doctrine concerning faith or morals to be held by the whole church, he possesses, by the divine assistance promised to him in blessed Peter, that infallibility which the divine Redeemer willed his church to enjoy in defining doctrine concerning faith or morals

Source (Vatican 4th session, chapter 4)

We don't have the official statements made by Urban II When he called for a crusade, I'd argue it's a bit of a stretch to say that he didn't bless that war to some degree, but if you someone wants to argue otherwise I guess we'd have to agree to disagree.

On the other hand, pope Leo made this statement:

God does not bless any conflict. Anyone who is a disciple of Christ, the Prince of Peace, is never on the side of those who once wielded the sword and today drop bombs

• He is Is the Roman Pontiff, and there is no indication that he's making this statement outside this role
• He has made a declaration which can be qualified as a doctrine
  • "a principle or position or the body of principles in a branch of knowledge or system of belief" Merriam Webster
  • That point can be argued though, "doctrine" is a weird word.
• Which is applicable to the whole church ("Anyone who is a disciple of Christ")