At first, I had "fear of being a sinner" vs. "fear of being a rube." Being a rube, though, is really a sin against intellectual fashion, a sin that some people are scrupulous to avoid.
The idea that Catholics are less scrupulous than they used to be doesn't tell quite the right story. If you think you can do something wrong, then you can be scrupulous.
Let me propose that, today, Catholics are less concerned with what their fellow Catholics think of what they do than Catholics used to be, and more concerned with what the fashionable (social, cultural, intellectual, political) think of what they do than Catholics used to be.
And it may be, not that Catholics today are less concerned with what God thinks of what they do than Catholics used to be, but that Catholics today think God is less concerned with what they do.