Fair point. It may have more to do with Anglo or American culture than with the West at large, although I think the same deeper trends are still at play.
There is little or no consequence in America to breaking the law - especially for those who have nothing to lose
Which country is more diverse culturally? the answer to that feeds directly into op's argument.
Italy also has a high rate, so have, for example, New Zealand, Australia, Sweden. Not sure that is all that supportive (and how do you define cultural diversity?).