That’s a total evasion. The RCC stood with monarchist, never against it.
Back-tracking in history, in the face of Huns at the gates of Rome, moslems at the gates of Tours, Norse in Britain and to the gates of Paris and beyond, Mongols in Russia, and then protracted moslim aggression for literally centuries and right up to the gates of Vienna and the shores of the Mediterranean, I don't think experimenting with forms of government was of great concern to anyone in Europe. Survival was more in mode.
As time progressed the papacy had good relations with the Swiss Confederation, and sided with William of Orange over Kng James of England, to mention but two examples. The American congress severed ties with the Vatican over Pope Pius IX's recognition of the Confederate States. The Church has by no means supported absolutists without thought.
To present Europe as an evil empire humming along under the jewel-encrusted thumb of the pope is as gross a misrepresentation of history as possible, one which takes very little historical context into account.