Indeed, "aushalten" in this context seems out of place.
Hi dude, sorry, as usual, it's difficult to provide sufficient context. The author has just finished going on about Roman megalomania from the time of Romulus to the popes to the northern Italians to Mussolini to the Nazis--all became megalomaniacs in this city, he says.
mbshu, vielleicht sollte "Bescheidenheit" hier mit timidity oder dgl. wiedergegeben werden: Fearfulness won't get you over the crosswalk.
Möglich, vielleicht: If you're not megalomaniac, life here is unbearable.
But maybe dude and Isabell have hit upon the best compromise:
And yet, if you're not a megalomaniac, you don't stand a chance.