They're what we all need to make our complex society work. Ask the tax people who'll tell you your taxes would be lower if so many government employees weren't needed to bail out the non-thrifty. Ask the survivors of the guy who threw caution to the wind when he tried to pass an eighteen-wheeler on a curve. Ask the local folks who volunteer to spend their days cleaning up the rubbish left on the shores by the non-neat ones. Jesus himself didn't try to save his hide.
Little virtues are for little people.
I mean Girl Scouts, etc. By the time you're an adult that stuff should be second nature. Messing with them as an adult just gets in the way of knowing God. The fact that there needs to be a Miss Manners shows that we adults didn't learn what we were supposed to as children. The piccole virtu are more than that.