From your own cited article:
"Possible reasons for the decline include the country's high incarceration rate, an aging population and an increased use of security cameras and cell phone videos capturing incidents."
Ooops. No mention of any increased morality as a possible factor.
Marriage rates are ALSO lower, resulting in less marriages that can be divorced. Again, no indication of any improvement in morality.
A VERY slight percentage increase, but certainly no indicator of a heightened morality. More likely, it's an indication of relaxed standards for graduation.
Have at it, but I doubt the numbers you find for infidelity will actually indicate any improvement, either.
