“I’m sure Pius XII would have denied that signing a Concordat with Hitler’s Germany meant he approved of Nazism. But it conferred legitimacy and dramatically undercut any basis within the Church for resistance. The same goes for the concordat many Catholic institutions are signing with gay marriage. It confers legitimacy on the sexual revolution and undercuts resistance.
I can understand why Pius XII sought the Concordat with Hitler. He hoped to secure a stable basis for the Church’s ministry in Germany. I can also understand why many Catholics (including, perhaps, Pope Francis) want to make their peace with the sexual revolution, putting “divisive” culture-war issues behind them so that they can go on with the work of the Gospel and so forth. Moreover, Hitler in 1933 didn’t look so bad—and respectable gay couples don’t seem a threat to marriage or anything else,” – R.R. Reno, First Things.
(Hat tip: Alan Jacobs)