>>>Smerel, are you engaging in “the ends justifies the means”?
No but for Pikuach nefesh purposes one can certainly enter a church. Believing that a breakdown in diplomacy can cause Pikuach Nefesh that allows one to enter a church is not so outrageous of a svorah. As above I don’t know if it is true but I heard from semi reliable sources that Rav Shlomo Zalman Aurbach told Israeli diplomats that if there is no other time they can work on Shabbos preparing statements for MAJOR diplomatic events (unrelated to clear and present danger) due to the danger in them failing to do so. One thing is certain in the case of Rabbi Hertz the svora absolutely proved itself given his ability to save Jews during WWII.